Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fc08d566977f52…

MALICIOUS

PDF

134.4 KB Created: 2021-08-21 09:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f300781787f79438ca3c76445b82bd6 SHA-1: 5d6089ed7f5da242be35495428682917fc188a67 SHA-256: 72fc08d566977f521277e9cfb973bd01f5447c5dcc7a3c7fbc9a2d397733e1cf
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for SEO purposes, potentially to distribute malware or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bbpcosmetics.com/admin/upFiles/2021-7/file/89781665915.pdf In PDF document text
    • http://ugyvednok.hu/userfiles/file/punewepitajeposab.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97168941991.pdfIn PDF document text
    • http://hncastlecable.com/d/files/sejamorosifurok.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ft3dnejjdrsvbknnbuc288a7d4/26212997994.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/bixojefixita.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/61699887358.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca580d8dc8---58798024267.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/bekivudufatikalazogu.pdfIn PDF document text
    • http://etre-belle.su/images/file/23637100658.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u4pm2u746u4phsq4s5ta3s1hl0/dimeloxovikalidinexe.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/28cd49ef299805179cf6a5ed738ef7b8/bumunavigatox.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052623550273499.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/79180317800.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/poloralozugina.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/29682335813.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc48b63b12---67318622622.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/05501b8aeb3f7b3bb53cef8a2cdebb33/36311459933.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/97657826841.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611002c977ba5---25502747308.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/vubemik.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/18074922074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=market+leader+upper+intermediate+answer+keyPDF 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_off0001a7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7EE 10820 bytes
SHA-256: 9bb8347cc785bbe7a959b13d129db3d81a8bff47b85151c2b4751c9166322667
font_01_sfnt_off0001c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0EB 19928 bytes
SHA-256: 61461eb8b4db1bb951560a1c4e06fa9ca3f82f4b9c786ad5d1b579c2ca55e587
font_02_sfnt_off0001f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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