Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac9094b811ea520…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 18:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fb6b421e8d3ba3958d7b3626607a6c0 SHA-1: 04fcdb3acbd7d603fa940cb3018d93e008190cf0 SHA-256: fac9094b811ea520a8f3b6157f0ff90a9f38e4e5287c36192884889b11a94a5b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous links to potentially compromised domains strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ee17d8d34bfc58a38b6c052b1c38865e/nexodokikugabasevol.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b894c03c860---bizopazazo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef2db1f79---tolepujikunokarivazabeti.pdf
    • https://info-jimukyoku.jp/lot/upload/files/tulaja.pdf
    • http://kopdesign.nl/userfiles/file/jirasadifekuvaribupumipis.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609236fb49129---zesemetadamugogudivof.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/30a365a009faae55155e3805465efe88/62599759906.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e3932a814f9edffb4a48f04757f019ae/foxivuxedoriputiwebe.pdf
    • http://preserveproperties.com/userfiles/files/ragedozusaluj.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7124667e1---41774224184.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3f642011b4d288e25151ed75ab35836f/miwomabe.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/17468172122.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b8b6cf429---21372166423.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/91cd12781c49d72724bc751fa6340235/mavibajazativa.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/864590d1e9b6858e11d39709a42fca39/63272110768.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/difhk4j9k7ul82cpjo19rlqok5/64370576900.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4d44894e---tivimebimid.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e6756c1b22dd3136a2a9dd3a283ceb52/latekanojemulefesado.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/vup0b687un9551ld95v0oim724/41891788097.pdf
    • http://gallery4walls.com/upload/editer/file/66765968842.pdf
    • https://energooptima.hu/upload/File/gaserekemu.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/dutesegajewizebevekone.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=public+and+private+sector
    • 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_off0000ef33.bin
3f43d3b001eb324b35006ae60126c685268c9be5f695ec0fc9967b12af2a44fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 10816 bytes
font_01_sfnt_off0001080e.bin
6d8fe9cecd72b0f37206a80577b4d62fc5316e4866189b57f63180b2cec70694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 17152 bytes
font_02_sfnt_off00013505.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 16792 bytes

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