Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b798fe39c34da80…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 20:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ef5141dce3f5a1bc12bf174832a58ed SHA-1: c3a011724eba706b3a615a59a1098cc47afaf2a4 SHA-256: 3b798fe39c34da80b091df3bf2ea1ed52380d7decd2e45c3d15e7345aaecba53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://irlanc.ru/uplcv?utm_term=wordpress+link+to+pdf+in+media+library PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083cad83247f---45492657499.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/274018fa16ee446aa03f5dd79130bf62/newejirufefufati.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefij.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/34ab77cd72f9db40a631a9895994aae7/30718007807.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/12862943746.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/rasus.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lsja9lnk1k368solfb4dbml80/37785290748.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/12oc1ki29sg1q875k78pd9pg42/tukarimumagifonuna.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/32509592956.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6vt6ukguv7r9auel8i1qrnm79u/79287038481.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gimatasepali.pdfIn PDF document text
    • http://artside.org/data/temp/file/baruligubun.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828e41a1e5---robavexofos.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/1110784121.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/xidif.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48e797569---figejope.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/lirikovez.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-22/20210522091536779664.pdfIn PDF document text
    • https://promise-land.com/upload/file/59193471693.pdfIn PDF document text
    • https://mauspro.net/upload/files/28122017776.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/51656056277.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae21d3cfe9---muritakevamano.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/97427645896.pdfIn PDF document text
    • https://ewp.guide/go/ce/ceserting-links-media-filesIn PDF document text
    • 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_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 17520 bytes
SHA-256: ff88d54a60b0b5f43de88674636baed52f023024a6afe5f4ced97ba44253a0bd
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 10996 bytes
SHA-256: 180a1f2d4c2991311d73682aed8c5af3ac6fab985f775ffdf59bd0e9cebf926c

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