Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67d4266c86d3fa4…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 16:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bd62a1b050aedff0a0dbe39e23d2a0a SHA-1: 183e73f9348f86c9358608dd40cc798bea5db7c0 SHA-256: c67d4266c86d3fa42b6bb90b00f44c6e27c674d3936ca53412400b3aae15e6a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to external PDF files hosted on various domains, suggesting it is part of a link farm designed to distribute malicious content. The document's structure and heuristic firings indicate it is intended to trick users into contacting a malicious entity, likely for financial gain or information theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/460455a5b3cfed21a1b43dce2b1c4a54/retotavuwedozanowefepasup.pdf In PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/2391523036.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/retidonukoravigaba.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/najanalawawitigem.pdfIn PDF document text
    • http://rcot.by/pics/files/38501766909.pdfIn PDF document text
    • http://vipdiler.ru/files/file/76427906542.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/79459545993.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/nuzivesotagex.pdfIn PDF document text
    • http://unseretochter.com/images/file/76143875378.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9d35e32---togunusomijate.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dbab8a520---40092820700.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2b3fc6b80---18744042769.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/zosedapimixarilili.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/58057968418.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/10133568307.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/motugetesufujabaxexa.pdfIn PDF document text
    • https://gornjastubica.hr/files/22222595326.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/55612913739.pdfIn PDF document text
    • http://gibisch.biz/files/files/99185449955.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/daziwenatikemo.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/91857914843.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/3295555836.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/kixomusevudof.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/gawinil.pdfIn PDF document text
    • http://partnercable.com/files/35555829976.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/51023299310.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/pimipowid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+contacts+recovery+without+rootPDF 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_off0000b289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB289 14520 bytes
SHA-256: 85cd761beaffa36c6f5be4c9b7b9c76aae19cff724047a0275c51f7435c29d7a
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10768 bytes
SHA-256: b726f0ac18aaa4f216c5f54e0d9680283fee322dcac0c8afbd81bf9a32552042

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