Malicious PDF — malware analysis report

Static analysis result for SHA-256 7594292232ffeba5…

MALICIOUS

PDF

66.2 KB Created: 2021-06-20 17:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ec2c3c22b13a8e9c5fa969a97060fbaf SHA-1: 232da58a1038be51453908a52aa8f88a0bf8e968 SHA-256: 7594292232ffeba56c33ec7fea82008fa9e5559feb80c85eb0a488f91f10fb3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=7+s%25C4%25B1n%25C4%25B1f+matematik+dairenin+alan%25C4%25B1+konu+anlat%25C4%25B1m%25C4%25B1 PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/a5kvl6jfj49nisnfkna9praa8s/15547385588.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2408a5ad040953699c3b7e9315af8b1e/11377246852.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff522a006---guvuk.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/70365496166.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cd60968ce0cbea91d0985616434aee79/bidofegetupas.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/tikalomun.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/65184939777.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d16970723---28990080012.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/112440493.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/69199e5090a491924b83e0f110b1aa24/wanarobelefuba.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f1f0ad1526da9cc7a5506787a09e75ef/tapagup.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160771e00db83f---fizezo.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/33217562212.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b86d741c47e---30826108565.pdfIn PDF document text
    • https://rm-parketi.si/uploads/majevulirokekoto.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2ec77d7f97901ba51ad3f492c911f94b/56379427677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 5132 bytes
SHA-256: ed5b4e5abc07243787c129bbf0340d40103d6601085ed48ddc3a1e0b3ebed28d
font_01_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 12812 bytes
SHA-256: 6f46342e3f82852b898e82d4bbac19dca47e121f9d2226d897de8cb7a430fc3c