Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52fafdb55f40ae5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 07:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2642d3c94f24dac6a178298ba02203ed SHA-1: ccdf4f5336ada050cf8273f180820212d3744583 SHA-256: b52fafdb55f40ae561cb34601192b0a0e3c8869a50fa5f9a2caffb5f2dd90006
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it's a link farm and a callback lure, instructing the user to call a number, likely to facilitate a scam or malware delivery. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick the user into handling a password-protected archive, a common tactic to evade gateway scanning. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://www.hz-kontejnery.cz/ckfinder/userfiles/files/270798363.pdf In PDF document text
    • http://fitviewer.de/files/file/92512295089.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/56969669569.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bc64bddb18a3dcfc222ff3ff5a482d4/36021547409.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/tiparitojolad.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/580639e8352fdbd949820a1a696c3576/wutizev.pdfIn PDF document text
    • https://seger.cz/userfiles/file/76541971166.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/43191076449.pdfIn PDF document text
    • http://iknow.pl/files/file/13982177624.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab8e5e57e---51362239548.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/49697373941.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/7246176732.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kugisoko.pdfIn PDF document text
    • http://someteme.com/archivos/_20210902031513.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/32073047686.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/lawapimiki.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/96554783267.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/34672403695.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090210361848.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/13350247714.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/givuvadazazudukupujetofil.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/57976342141.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109091030068789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=transfer+photos+ios+to+androidPDF 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_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 10512 bytes
SHA-256: 4bf8059c59765755215c37ea9bac7d781a96ae399159cf29b4f2d182448424a3
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 18912 bytes
SHA-256: e8427376bf3c796708de27f320f614f31a5675aa9d3f28d80e8a7f8cd415e36a

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