Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab74f1bf7a91a13c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 15:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7fc246be7e06d2151a9a372ae2a0c14 SHA-1: 254453c556929a7750ebd459583de6de242ac716 SHA-256: ab74f1bf7a91a13cd6a0ef2a725f32c86470e7140a7dafeda170d850188e1833
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. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c8286ba82e3a8b5f2c75ee2244a67f58/dukojukajisurodolugonegaz.pdf In PDF document text
    • http://amandamaitland.com/images/file/mopigo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/22427628385.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105c96fafb31---35856237774.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/66487342161.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/nerorepidafofimipot.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b957149e7---72642249653.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fd05188d9ade1ea6e843c534425b4772/tekimewunimofuvunarumim.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/zagedaziw.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91f36b719---dukarugalixuwixulexikoguf.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994b72051ab---zikevas.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/14925237392.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0dcac963---39372869196.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/3714650069.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6ahkut7dom18pc2ngbmkq7qbd5/32998655902.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/luxovimame.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/rajuganaxopivakivibevulo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/papovujupitagogokumumimug.pdfIn PDF document text
    • http://chinalabware.es/d/files/nogirajuvevajowezotu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/56c73f4473d07b591ef745d233e476b6/76068324664.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rutis.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/98124755967.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/zipemisut.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f461ce1c5eec3033a5a8663f753a3015/vusomalogakenipuzabake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sql+case+statement+in+where+clause+multiple+valuesPDF 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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 18496 bytes
SHA-256: 43108171f1adc411557fd4c4b497880ef1ec56cfae52c1f125681458639af96c
font_01_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 10992 bytes
SHA-256: 170a6e91d88774fd16721d51d7493eaaa2b8809d38dc8327e3bd28603b0f3999

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