Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a48e8968dbeb335…

MALICIOUS

PDF

100.3 KB Created: 2021-06-13 22:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a4bba2a8881935ddd0f7c6fa337c8f54 SHA-1: 3003a20153ba34790cbc518d6bb2365237cea3cb SHA-256: 3a48e8968dbeb335e72745eae82877e5ee70687fbc17272112b46e11e61b658a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Wow classic pet attack' and the authoring application 'wkhtmltopdf', which is often used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=wow+classic+pet+attack PDF link annotation
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b409446b4d2---filuz.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ec0dee338e39f8cbef72833b7b0fcea1/xumozijuwudafe.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4a7dd8634241f251067d36ed274cd588/vapijizurerulexamalu.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/5988111941.pdfIn PDF document text
    • https://naoshima-habitant.com/tunimati.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9faaf6da167ef10a4263483b46b57501/mudawijumuxawib.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/jufakurojag.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/af5f38585aeb62d4d19aad5afc53136c/kotamagugaxiriletavenajox.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sglonun5h1s7hhs1iifajuhvbu/vanilolirataderoz.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/4101648601.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/84775577828.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609725f00d6ab---nagiweduwopuno.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ecbb73f2---walujofadijufiwegaza.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/gujepunikewetotu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58f39678---38051345826.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c55b4de0159ce13221356557dc9151d0/pudabef.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_off000151bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BF 5000 bytes
SHA-256: 77cd9f5e624c7f57853bd9626dd9704f01531a6078c1c8f34236d5b730fc0063
font_01_sfnt_off000162f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F5 10036 bytes
SHA-256: ed21c6db8e7062fd4a8db9eebec765ce98ca36cf034b895f21845f26052a9ae4