Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab41635576466f5…

MALICIOUS

PDF

82.7 KB Created: 2021-05-06 11:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bde6942b93b4cdc80109614933fc8208 SHA-1: 2efede0c4c35c5f8268cc1150043e7aa3c0cb5b4 SHA-256: 4ab41635576466f5d565a2fd762acc615920e878198072814df9102981d3ae5e
204 Risk Score

Malware Insights

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

The PDF contains multiple links to potentially compromised WordPress sites, suggesting it's part of a link farm designed to host malicious files. The presence of a 'password-protected archive lure' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/27ecdee2309227cd4099ebc211e3df56/80837006589.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc828774c1---vapoga.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf50834ade---fixifolukofomivusurefez.pdf
    • http://akinmedikal.com/uploads/file/lisuzisu.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4765adb7c794d8a830eba75c41126718/nadoloxu.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f8b205d4---leluxivi.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/40f5fa25f9a9edc90550bb2768355672/39841247158.pdf
    • http://arci-mp.fr/admin/File/sanet.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5ohl76889qiusoc3ners4s6co0/47338529621.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe9e7eb99---62729405433.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0jev1dotcplv55smj774o8997n/92390281383.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7m1iskm3qnonn0c8btpa9601br/98540427078.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b110b8f43e---zamuridapekigawugow.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f565fd299b---kerepugomewilegipuzi.pdf
    • http://fouladsazanco.com/Upload/file/vegiduwamijogov.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8356ded98a74fbf72c0e85b3b11277ad/83724071559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=penumbra+overture+full+version
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a8.bin
6e07f433bf715f686cd95a6d68630dfa53f37bfb9a1dc28396fec7ce7842cc7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 5116 bytes
font_01_sfnt_off000117ff.bin
78575aa0cbf84aad17fad0aac010f87a15886d12ca78184ebee9d93146b1563c
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 11196 bytes