Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1cafecdb82751f…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 12:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fe04c013d3e89c624b3a3b7c9d3d5df SHA-1: 8d5ff0667e7dbaed365f80cb631a2ccc8a227063 SHA-256: 1d1cafecdb82751fd6364e41ae6e30cc7440c7df9e063fb330b1835a46541ee2
296 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF contains an embedded script and multiple URLs, many pointing to compromised WordPress sites. The document body and heuristics indicate a lure to execute a command, specifically 'powershell rename file with date', likely to download and execute a second-stage payload. The embedded script itself contains metadata related to this command, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=powershell+rename+file+with+date
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4ad388eb---55150306206.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5ca900ef6aae092e0006ff93421b6b23/nafuposobugosinuroja.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24408e209---88790080885.pdf
    • https://cardion.dk/gfx/fckimages/file/woduzipikekov.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160904f80e0bbe---paguburi.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b78a1da3e---13934599935.pdf
    • http://www.europesolidaire.eu/userfiles/files/81419322714.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d407315649---kagul.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b10fb38f8---detet.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/86542481150.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d381f95997---42044177823.pdf
    • https://arerp.kr/data/file///22948162983.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cf4f9e0bc1ef7266118d123908f0dfb1/xonazamiti.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc26909201---xutisolodetibidiwevav.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/48a9c61684106e716b7e6cf085a1b799/74220458946.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b043db3063c---tazegowigunidofizabanul.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc35cb67a---zokarerusotelavugi.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087aaee92cf7---mugerivifabolew.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cd97351dd62b93365c8da176330e067f/60187564115.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c013732de7f---fazadabemitiwewiworiwov.pdf
    • https://autotronics.vn/userfiles/file/zazedutenadevodafidiz.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/aa6b177fd8c126602003c386cd586e6c/nebenogoterebusedogidiki.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/59c1f1d0ba7706e8ab567e3a84b8d37e/81206721187.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f3prajo184cinv0smbo8mtqgm6/xofamonapumasajejojav.pdf
    • http://proxima-design.cz/files/file/buroxezev.pdf
    • http://rusiuojigalvoji.lt/w
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00016278.bin
41b7c1c37b8665999f27c89c266df4befed35c5a88688197e440e65222b963b2		 pdf-embedded-script PDF raw stream script payload at offset 0x16278 1579 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s).
font_00_sfnt_off0000f937.bin
5ac6103cf063b2d7aff9f1f514b75ec3c25a2c428916f2a85948da894f366e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 10704 bytes
font_01_sfnt_off000111a2.bin
d944a6e38f8e4c6e4a9d3332d2a309b0b0d23b14a6f39abe69c2486b6e24cf51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 18388 bytes
font_02_sfnt_off00014277.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14277 16792 bytes

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