Malicious PDF — malware analysis report

Static analysis result for SHA-256 9129f9e5e5afd2ef…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 13:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b3b6658fe536cb1d0ff90caaf1c5813 SHA-1: 8259484769a044c8409941f9d0daab5474749a97 SHA-256: 9129f9e5e5afd2efd9d762f3f91d5ba2072a5dce353185f350bdcef2495137ec
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/12squjvm8uroe6e0d53tdcb2aq/gugerenogikinaluxiwiram.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe25a2bdf5---17137022681.pdfIn PDF document text
    • https://soechi.net/userfiles/file/58877061601.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/86743186679.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/82080997858.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/rebefififadalupipat.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160866e094ff0e---23056062569.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8j3m5hlp513doimmnl59i78jmf/20124457201.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/48817389485.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094044ac0980---46149629389.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/5338ecb4ab7794de77b4c5f3178f3a6b/kosagujegeguvevagopu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609130f1a256c---biremopijerepuxakuzib.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/65939638146.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/62434012486.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cddfe9bbcc709f8261604f976b3d633f/zaradujejavalikakivovatib.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0gk239hsdgo93tqp2pcc5oee95/91369805435.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/buxeresenumok.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/ziboxezezamoxo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/774616f5fb3a91f8392e0ea2fb26c708/fodokolupulazi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85060969ad---28987990307.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/12e0fa815f6fdef64419c2520a67bf1f/juvebikewab.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/bukakalegimowan.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/43378197338.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vonuzuritalarasanox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=way+to+success+10th+social+science+guide+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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 11180 bytes
SHA-256: 60c2a0281ee493f5235e2def7e8130da1a7defc243cf1a41ff5b82b0677e3737
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 16872 bytes
SHA-256: 0edf2b1fa566605d71b983944d61e7e53465349f13edf2d4c29e8e22592e9fe6
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1