Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6a6df517f91a29…

MALICIOUS

PDF

158.6 KB Created: 2021-09-01 08:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8516f5079fa132c91ab3bbfee11456c2 SHA-1: cb8fc2c90fb255ecf9f91d1ae1da53759e54a72b SHA-256: ac6a6df517f91a29cc85465cf024607a7801e8ca91848e7b4fd2b3b6808d610e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://copy-office.it/userfiles/file/kibedalagosefujuxuzizabe.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3e825828---jixivejezas.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/18862554289.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/49679583266.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d25833faf87fd4ae8870b62353e85fc7/pavugekik.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/77394157182.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/wimedugo.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98212256380.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9d268c6c---soxevawebimajoki.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/70728080749.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/99090371786.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a72903e4e---9142426327.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/nefumirin.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/85556870415.pdfIn PDF document text
    • https://heyratacademy.ir/file/74565809875.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9611df5d---watigujidupajepubo.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/12277160442.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fuzokuluzozep.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/17703682432.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4oqmr8jbk0hmor5tctfcnn11v1/14310093490.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d0923247d0b078f998b6e4621065c8e5/73086855165.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2beb9cd5c---11000368100.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/89338346016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=thug+notes+beowulfPDF 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://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_off00020555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D6C 10428 bytes
SHA-256: 1a706c53b6d7b5e0896166853d1ce9ed077742b3ee74f405439842842510e8aa
font_02_sfnt_off00023519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23519 21648 bytes
SHA-256: 403ac3e826f244c6e02153da66f07c16ee7b4e57342f4c0436aac04f13109920

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