Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f68e3eaac647b09…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 11:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31b0b614839bc735421c0b7998d56720 SHA-1: 45f7ce47b1ee3029f5cbc357b17577e3caf36f33 SHA-256: 3f68e3eaac647b090e9181ef90ab062ecd4d858f9551269475bc87f084eddf9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. The primary purpose appears to be redirecting users to external sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7548630bce---8998796747.pdf In PDF document text
    • http://xiangzhuan.tw/upload/files/84185053567.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c5757dcb8aafabb101c51a03d5aed165/luvebomutefenesifajodama.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kevisopawabebowovetoj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/61951287561.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e0b9752fd380933e2ffd37ec19aeeec/79745743153.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/11364215003.pdfIn PDF document text
    • http://coffee33.ru/archive/file/monigekewawarizozaj.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2fe78ff2a215131add69eaefe2d6b665/11954230798.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57b7cea3b3---81919657539.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/wegifevolab.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/nemikaj.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b56c425915b50b8687566a223568d9df/40019959283.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/31851695960.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/j2jh9v8il00vbotm5qgub8b914/92867610505.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d424770605---93626558756.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/43997336259.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qg8p31em64m0653sqs3fo9v7q5/5114702605.pdfIn PDF document text
    • http://gabortech.com/admin/file/divor.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3fbab8cb71b0389bb917e564eb96ae2b/95989053562.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c3e62a030d4a567c963a735377cbc021/kesiwamore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pencemaran+air+pdf+jurnalPDF 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 10628 bytes
SHA-256: 2ae8a138fc6d0c5fd090ac185471df95ceeec933b5e6202cb73b1622112a34b1
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 17748 bytes
SHA-256: fc680f16c39ea5852244da8d10043a83614ac0d84dcf9fa5adfaee73c9a657ae

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