Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0f6f21166ab7c0…

MALICIOUS

PDF

96.7 KB Created: 2021-06-13 14:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 46fed624e9ab0a02a221ec7cf804f018 SHA-1: e63cffbe4e0ce55f048d58708b3e979034e5a444 SHA-256: 6c0f6f21166ab7c015d1bf514d81d857dc569dd3a1d70236c4ff99f84e977fbd
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://philabc.ru/uplcv?utm_term=semi+dense+bituminous+concrete+mix+design PDF link annotation
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0jptl0ll8frohepp8lgu6ckd2d/lezafujisunob.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff28c3c84---54574368434.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc1c2cce8---76955892515.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1trqrg45tu0qhfjbj2ft3kee5i/77892580967.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/nitexeruralapipofonelob.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/db03a07e4958f01f2979625bf2f3094a/metupuwajuxasunenitoros.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/527f215578f208118316bc1576b3e119/51433223472.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/72759fecfcbea881b352ee9f182430a4/37510370991.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/23127637689.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f5e0971c54259b412daafde8a5b6016/zodesimifugebed.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9f1f853158d1c9789ce691776f6911f7/basito.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070478df0177---pudozetoj.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d0fc1774---62520220807.pdfIn PDF document text
    • http://allycatering.com/userfiles/fezojufedeluxesiw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806934abd9c---89171578915.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3988cc2927---kojerufunenupuvepevo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/365bffa4627cdb1e3b00202947e5f522/guzasub.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_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 5328 bytes
SHA-256: eb01a6a95d58fd90716ca1b1790ad43af2b09c5ad697a0cc0c1b7a4af0cc5cf4
font_01_sfnt_off00014881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14881 13372 bytes
SHA-256: de7a968e8b9745980ee0f0256cd99fc9e215c83560c96dbdfa5a468effe521c2