Malicious PDF — malware analysis report

Static analysis result for SHA-256 167b37751e746a50…

MALICIOUS

PDF

61.9 KB Created: 2021-06-18 13:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 264151c8ba11936807702cfbf42ae1d5 SHA-1: ae22149f2ed72ade76e9738fb8babd316c0ac1a5 SHA-256: 167b37751e746a5081c439ce2f4ffef3a3add23aeee3b6e4257722cd8513b84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external resources, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host links on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall detection indicate an attempt to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7cd33c51---nivutav.pdf In PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656393c9b0---12567153633.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160930d9d5b8b4---ditim.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608835fab6bbf---40344749147.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/feviga.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i4dhg63a33dvvo1uh9tsba2310/87324291865.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/81fdc891b8ce247cc478d697c3fc273c/91385861371.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/53527730187.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/nemumiralivelanefijevok.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bec2aefbb969afe323a6bbf378dedc2b/50446599940.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/80cbb4d0c45675b84be6884c60bbd5c3/sixore.pdfIn PDF document text
    • https://inifd.london/uploads/file/vukorugi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b29f7ee2a---74212778755.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/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=diamond+ft+teni+sound+mp3PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44F 5220 bytes
SHA-256: a9a759c945046bf6ee51093e89200ec8f90f4bad4168cd3de534d6decdaf0f9f
font_01_sfnt_off0000c612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC612 10892 bytes
SHA-256: 2a9cec336e67b8aa8acae8abed3aff15bb363c8a417f761451ece480c34f3491

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