Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea3c17983d1ae2f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 05:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6214f521ab63ff73cda5fb0b78384585 SHA-1: 39ef4d4907fc60470039e3fcba879e0f448b57bb SHA-256: eea3c17983d1ae2fac12e1e1eca7a7e3c068a1e67804ebd805c090e1ca51d720
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous other PDFs hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://podiummoda.ru/userfiles/file/lepusawoxawaliboluvapama.pdf In PDF document text
    • https://monyetmesum.com/contents//files/gevaxugikusulo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084caee57fed---70683311234.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/molozamufajobubadux.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/nenofojoxew.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec28b4d6bb---vususitule.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/65496744122.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/denudatedepojajatu.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/13839490634.pdfIn PDF document text
    • https://temahr.hr/files/89876264003.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/98749710711.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/robogaxojujosudeja.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/n103tcugtoudj4irrf0ucnk6pc/merusokuxamituxim.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/mifapenefujafetukemadopur.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/bifelaxivujidalib.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/junugegup.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dezitoto.pdfIn PDF document text
    • http://candientuvibra.com/images/file/lemudomimegelibipatujuge.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/83788866317.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/26439281150.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829e0f71ca2---43603699526.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160700163cf97b---37208565841.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8442b6eaa06263333347bfb39d3cf6b7/lazasakines.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=html+to+pdf+python+3+flaskPDF 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_off0000be22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE22 10808 bytes
SHA-256: fa6d624492aaecc37a3daa14724afa0aabfdcad5e9868456108d616efa058edd
font_01_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 15872 bytes
SHA-256: b67b96590af90cb43cafd95f3738c3989172d15f43a76ce749f9e1c2383bc4c6

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