Malicious PDF — malware analysis report

Static analysis result for SHA-256 acad7cbf8316817b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 13:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e949c7ac3c221af3af38d0c5796cc86c SHA-1: 4124d17c8cbca3943b7cc622f415c43bbdb19925 SHA-256: acad7cbf8316817ba8a29a4feed3de72c5626e89d39a2e1dfa8efea261c438d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links is sufficient evidence of a malicious pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://conelser.hu/fck_uploads/file/tejoloj.pdf In PDF document text
    • https://hssanesteban.cl/files/joluvisijedi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081c837a9909---47390287342.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075aad6e7c8c---51372888355.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/274ba162bebf5b47d8ecc614972a7b7b/93704432198.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/43903682462.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/50781534157.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/86280182188.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/benobopok.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/54126723595.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/93425522468.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfda153174---zinebi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0704b11317---61396636279.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/65377514864.pdfIn PDF document text
    • http://digifast.cz/userfiles/78261326820.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ff5dcltuilpqcbk88ah1h89s75/87530452810.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c150c9f8538e623206d13461c3c093ad/ragiwedizemidalofu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b6f63880e692a7e079f7daa99d3c8173/kepifubodinizom.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/61887497946.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210904070024.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5177f7775bf96a9481a539460abd498d/87262887784.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1b55b2ca885b0d78486ecd33237cff3e/60655249333.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/motewisumavuwub.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81e02dae41---3154262489.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af00f18c5---vibifamu.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/webusozav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fuji+x100s+ovf+manual+focusPDF 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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 10716 bytes
SHA-256: 58a05add53ade62be42081d334ff05c48b5128ea7c681927d960af25450700a7
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 18652 bytes
SHA-256: e5ebf67eea3d257c2cbb0a8fd55aebacd68f53e83b4fecd6078f63fbcff123e5
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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