Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ff0f619eeaadd2…

MALICIOUS

PDF

104.8 KB Created: 2021-08-22 01:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb59e32c7ee1d1f8614d0a4fe2582633 SHA-1: 5363b46a27ee3464102580f5b9285a798c383014 SHA-256: 86ff0f619eeaadd23a829625b2476b0b3f625ff775546686ff3cfc6d545b5f79
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://iringmalaysia.com/ckfinder/userfiles/files/96640100090.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/wovorepivibuj.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rulesofumekoxugid.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974f75be42a---dibomadevupixokow.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7d5722a88363837242cba269df22fe44/vekukodarebagusu.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/52538784674.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/60368499411.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/xekadin.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/mabigeboruxikifanumizuni.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a59e3605---48874934086.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/28704901092.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/82447548713.pdfIn PDF document text
    • http://darstin.com/userfiles/files/7359598383.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/21651818408.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4d696979115cf6f0e24d71487e40f4da/15719579903.pdfIn PDF document text
    • http://tulga.ru/editor/files/5221410663.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/77515496669.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0bc24277a5caa4d7034678db6a9ba286/6228654289.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/71112219292.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/puxiponovara.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/80adcc0687678049c0f6d50d90c48344/82610778864.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/biwomeginafigilikazalune.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079396235d25---51962605835.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/xijuxisevibivoxipakeroda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+a+silk+touch+pickaxe+in+hypixel+skyblockPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 17236 bytes
SHA-256: 935baca9fca534708a4466e739562d18273d078d25807033555b68d64d5c4fda
font_01_sfnt_off00013014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14826 18656 bytes
SHA-256: 88eeabf2a9357f14e803f4e16caa7905d31936b7e4eaf3768240aa449a30d277
font_03_sfnt_off0001799b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1799B 11176 bytes
SHA-256: ebabc6ef06409e6d8e91d87ea71a2f867f18ea9565d94723432367a8993cc800