Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f44c6a2aa61d7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 06:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c78eab2417c2e1f529d0e5e2927f32b2 SHA-1: 837dd0e5c6410d664b5b83e224e741ead7cc8747 SHA-256: da3f44c6a2aa61d742ebdc2f9cd088fd9a61a39b9788ae6a7755ad296d122d55
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a 'clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste commands into a shell. This is a common technique to trick users into executing malicious code, likely to download and run a secondary payload. The presence of numerous external links, some pointing to compromised CMS upload storage, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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.
  • 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 http://kleinschadenexperte.de/userfiles/file/10794430453.pdf In PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/6403f9a856aaf9f64ce2ab03645b694f/4621322081.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607863c2ef655---54318729170.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o2cv7473eikft9vurhe15vg80t/tomapemoxarelulorobexijo.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/xazifebomot.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/39614174943.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/58896189855.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/zaseranizenama.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1d822a69---lavonet.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e8e9caa9---38046535897.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/75696644078.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9sgvkbjg6u05s6dndmksuc935v/74014505216.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/13747395895.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/nozegudetosadewexax.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/kokul.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/todovomatirilele.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/munibomorabirefen.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b6834b21---wutebarafabijuluge.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/burixedumep.pdfIn PDF document text
    • https://kimcert.org/E/file/wesiwavidufiwabafeludobu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/17717138981.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/xuvavaxikejabenaxilipajo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15d0dbf3a---48265528605.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/31539788874.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/42578832006.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a18232c70---vutofolofasenux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lcd+16x2+commands+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 18036 bytes
SHA-256: 3991ab619669c3da6d6fe85fad39c80ecbe8bc0d73f400e877386ca1a10fd9fc
font_02_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 10712 bytes
SHA-256: c293109103367ae43695a44fdf7fc3d92aaf1ab76779db3dd77d62dafcac5a20

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