Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b9041ed13c98a5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 14:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cb209513ce71689a5958b1b79b055f8 SHA-1: 634e00d9feff52d59fd5dd862729dbb96a91c3ba SHA-256: 28b9041ed13c98a5e6623b9eabe361151fbd46db90e0378afe243cc273373cf8
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous heuristics indicating malicious intent, including malformed streams, link farms pointing to compromised uploads, and ML classification flagging it as malicious. The presence of a visual download button and embedded URLs suggests a phishing or social engineering lure. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iamtimeshare.com/userfiles/file/sajobowurowobojol.pdf In PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/novilipexo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/48328658468.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea6e6c8ecf---dujugazumopibixurude.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/zadunurefubofaxegaki.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/zagorelubolisop.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/luwavafasojevovuzowov.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d98a4665---64644145272.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131d1fc1e073---17572056169.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/wakivamus.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3ad04498b140569a2eac2bc00a806e38/vanapirajavuk.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pn3dj2d5gr2bpocg8hmquv9dt5/73751767516.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210907_021840.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/fepikudonokesavidem.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/silikexogapujox.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419201d4360---pegakenapipidinibet.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/42291973257.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/60463946890.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/2029586201.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/62112425477.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/66472226352.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/zobilajowezogazudaju.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/46253710779.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0sbmuuktrmojpec3jj2m6u5hnh/bizateripalututexa.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/30644496666.pdfIn PDF document text
    • https://petala.gr/userfiles/file/21420520926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=han+gong+ju+full+movie+download+480pPDF 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_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 11256 bytes
SHA-256: 04d51a4c9d04107a366074d34447fbcaa56cae4f945e445a397f7094100d0768
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 17292 bytes
SHA-256: 4769638b92df317c102437d46ac202cd96a052420c1c0b3b6b6fcde59a1eb128
font_02_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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