Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b2e2e9cf968a18…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 19:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44df74656b689730c755a431d6449336 SHA-1: a9c3ccfdc488cfa1a8365d26e7bc49cf9da03147 SHA-256: b9b2e2e9cf968a18ffa1cc6e446473b832856d9e9d4b8ad31b79b06245c40e8c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=past+simple+and+present+perfect+tense+worksheet
    • http://hmsendo.pl/uploads/editor/file/66954319082.pdf
    • http://hcvitamin.com/webroot/img/files/ximiwesetumoreboniva.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/72253015235.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7e336281bb237244829e03548ec2bc32/gewilalarenabuzaseb.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/rejukopiwuzanuvawabenad.pdf
    • http://cartopack.com/Images/file/pogomo.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db98d6cab81---68958912242.pdf
    • http://xycrusher.com/d/files/37518458382.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160893441ba6d1---27756669031.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6tdjb4gublabokthvf9i0s82t7/68890082843.pdf
    • https://xylemleads.com/userfiles/file/misikataduweduwuv.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c641690d01---73440266425.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/60095728294.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f3434b01bd2b74e5d98b505fab82f05f/kiwuzozomaseloka.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f17ef6d952fea520ef77cc1af1f694a4/51665738412.pdf
    • https://samsungklima.net/upload/ckfinder/files/donawola.pdf
    • https://trouver-une-ssii.com/img/pics/files/36527952512.pdf
    • http://bezagsecurity.cz/userfiles/65772176076.pdf
    • http://www.gamylai.vn/uploads/files/98198414458.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71d37b15ff---mupit.pdf
    • http://phantasos.org/userfiles/file/nobelemidotojuginevarigef.pdf
    • http://ruoumoc.com/upload/files/zinuwumeridomut.pdf
    • https://infiniteprospects.com/FCKeditor/file/88048754288.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1oc58jcovsnok0e7u0aaruso67/fabupatizuzopuvezasel.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1n10g86uvtvh7gafon0j69c0g4/tidapifulelejogixuwimep.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714b9390aee---92095208191.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e075.bin
e807636adc66f371875a5a61f440ffa9819a6de28237ab030ddae7c739057d21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 16960 bytes
font_01_sfnt_off00010c3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 16792 bytes
font_02_sfnt_off00012452.bin
84707db0fb29141716a7e075d99b04b3483c6d863e178a0030059825a5308d66
pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 11064 bytes