Malicious PDF — malware analysis report

Static analysis result for SHA-256 80554f3658b5078a…

MALICIOUS

PDF

82.4 KB Created: 2021-07-13 11:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6219a31a6b81a462ae6224ef8b4e1d1b SHA-1: e201ad34e227cdcfc1e22d864e53d9e0d404f013 SHA-256: 80554f3658b5078a6304bf81a5a1edc366239b07fcf44c66b21b8d39b4c93239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=liability+only+policy PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/31obsh02srv2lnff8hgqvb40f0/59442064344.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/63292778987.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ml8gs1a8ikj937a9i52kgc8417/54166184698.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8mi4648nms42n8lor4hgblobtm/pefogesisug.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f125ff30---numexufelabiguma.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4373095067cead34a700a760cc3f5377/76553287987.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d5a340c45ced97f6743d5ef456d0cab9/kajani.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/mogogi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xiwati.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d42e656e3411f5a1c00917aafbfe4429/5221278611.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/csnh2u518fgsnsl2i7vkmi9ns3/zorodasovo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a679ba6fe1a---9890469814.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zuwunatudak.pdfIn PDF document text
    • http://haki.vn/uploads/files/tefikimekipevopikoxav.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d21bbf61---32095223692.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/40116338760.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/99638879684.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce29c591c---xuvojupopuzarem.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab7b6526a5---60343568166.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e650310be8---38223414164.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/48502074461.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078419d2dae4---jatoxumopom.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/eeeffb388b03141a66bae29184d4d1c0/mefexenusezekoxinuf.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16400 bytes
SHA-256: 6de80a5a5dd1759b527d1e7501e0e74226f749e89f7a947c3286090dad74b5bf
font_01_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10176 bytes
SHA-256: 1789c23ff118e2a25997f5741b3ff4653dfb0965a715a1625b1e85b99838c87e
font_02_sfnt_off000124af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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