Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7c5cec4cf45a37…

MALICIOUS

PDF

85.9 KB Created: 2021-06-24 23:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b6df63fc2dbfcf2f0c0716b1a4d78f27 SHA-1: bf4531b9c86c9eccc35e4d297c0a9024a2ad3e90 SHA-256: 1b7c5cec4cf45a3761307940a6245abfdd4dd85fdb19bd4816788fd62d0524db
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6787

Heuristics 5

  • 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
  • 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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160750816b6b40---fididamomorafavuviludigo.pdf In PDF document text
    • http://cnzgks.com/userfiles/file/%5C/xawalufap.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/97952746868.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/potixomimubax.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/72971455871.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c557be504f7---zarurabipikoz.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/5039624134.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sodajowal.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wakinonawabixitotifi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96e8b1fde1ba92acb55d690482214ce8/96131369968.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3kgks6fh20s8vopphchvjmv79a/vajexigap.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0ff060997d29d958d56dfd43ba7e86ff/58430353113.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/gbevjdhfjkrnbjt8i1e1sd99h4/zitexivofaxenewekowezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=numerical+analysis+books+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 5380 bytes
SHA-256: 023f9b1becacfd86496e61b433ea2ca61f5057dade04896b5b88325e979f1695
font_01_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 13080 bytes
SHA-256: 85b36a6d2ddb6c7cabe3707f3ae17436b340b00c28d78bde279c1f900a4bdfca

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