Malicious PDF — malware analysis report

Static analysis result for SHA-256 baeb405a1b08cf2f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 21:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 485ab58358142df7e30c9104fec7e397 SHA-1: edf6605ec417308d3dc7bd93c637b67ddd9143ea SHA-256: baeb405a1b08cf2f06ae6dbd40c59d83e7e028efc1df6d55795e7d6bccedf556
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to files on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked PDFs. The document's structure suggests it's designed to evade direct analysis by presenting a link farm rather than direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://icoenergia.com/userfiles/files/diwal.pdf In PDF document text
    • https://zbmbudomont.pl/userfiles/file/lujekovevirakubal.pdfIn PDF document text
    • http://climtech.com/files/files/13828949590.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbb23abf74---binejetesujojumegunivokef.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e56d2b270---boxefirisotibifoz.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/26578096336.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/550905056.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/guviritupevo.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/kuvevozefigijadavodig.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b0f4ece2f83619ac8cf885e7359878fd/sutop.pdfIn PDF document text
    • http://classtool.info/upload/files/11660643833.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/sotuxowidexebixekaro.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/penusesuvutadepavilobona.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/31554754293.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/68103723866.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/24948862862.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/jirepasavezubakotesaru.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/72105121090.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-5/20210905033213201808.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/goziwofivukujek.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8jkvdghedl6hsk8ub4sahhiv43/werikiwaxagat.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/jagubofosoz.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/jimowofazidamejulefapakok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+ip+calling+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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16804 bytes
SHA-256: 18be8c31f5be26cc849a62694dece3e34dc758ac2ddc5b15852e99932a57689a
font_02_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 10380 bytes
SHA-256: 5d7c83dc631308de4fb8f6ddd55132d028ab1b3d65243247f1fee8a617acce1d