Malicious PDF — malware analysis report

Static analysis result for SHA-256 4166a03de935d080…

MALICIOUS

PDF

87.9 KB Created: 2021-08-01 12:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37363935a248c67e857ce914a7518282 SHA-1: 6d7fdb39a88a8f88426c54de80c9dd7fff7001c5 SHA-256: 4166a03de935d080a205f2be3fe685c9ff128815a5c5342c73fa1659a9cb5b00
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160edee8d1a028---65970576099.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6a01eb5351a9075d7a1635fd37953caf/madepi.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/wirifekaxiwojozonibuwa.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/logeb.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6b003d81ab8f4b184a2486f02f0f78cf/17575567382.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/870889b4ace589e2aac7ee53db43bdec/35215153752.pdfIn PDF document text
    • http://standardamulet.com/files/files/dubegeteloxig.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/62747265364.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/92901365242.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098550c40594---luxowiw.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f0dc947db6cb2a08a976242f834fda9a/fudijanix.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/14e800db7dcae01ab650421e0e4b886a/dawitigaf.pdfIn PDF document text
    • http://atek-ent.com/upload/file/86710766011.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f5358ebc---48902965531.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd8544a67---bitozolizowel.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/38407002781.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/soxewalawub.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dalen.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3mb6gue24595l335r3rpj38ml6/soserafavanutewupu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/29639532585.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/sgk4o0qt70tv6h4h07ea57m563/62889854643.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/papadexedupepewuzubavizir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=instagram+older+version+appPDF 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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 17088 bytes
SHA-256: 2b80a84fb4069307b6875a75de634ff5a612058b0d26840a1597474174cf2dbf
font_01_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 10752 bytes
SHA-256: 52178509271dce06a6865654273f0ad1b7b8b118195a1eb61575fb0f11892e90
font_02_sfnt_off0001391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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