Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca24a0cb9c3507e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 20:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3afd5a3f9847709823ee903eec87c6bc SHA-1: ed93ebe1abedb8c71019c1d8d5b3bfd2e9e1219a SHA-256: 7ca24a0cb9c3507e80b5ab87a0f8b303e02f3666002749f13daaf248b747138c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it is part of a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=pc+to+phone+video+call PDF link annotation
    • http://itemclinicchina.com/ckupload/files/67560059557.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/28181200579.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/e9dvfst61mncd9t11kka9617je/zalolodepip.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/71886643632.pdfIn PDF document text
    • http://co-mit.com/uploads/files/49636636986.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vibuxukadu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/35840731309.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/viravitagoriwupoburixe.pdfIn PDF document text
    • https://baglab.pl/galeria/file/raxewezaf.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/tikuduwipop.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0919e0ad5---livakabeworejewutuxigo.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/15377646319.pdfIn PDF document text
    • https://reniuved.it/file/42730783642.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/guzojepadawi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/64205528804.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d4b06109---mudofonipiwadumifo.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/16819898956.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/lezuwotobubebivegared.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/75394220527.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141666a47e2a---71321106169.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/zegatajefajatutewub.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/kebevajilo.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/22848840731.pdfIn PDF document text
    • 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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 16944 bytes
SHA-256: a52c062e6e7a43f6390a4989933f3e622a2dc29b7dc13b78a53825892ed7abd5
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 10408 bytes
SHA-256: 031787e7f2178fcca6f58c3fdf0e985530f61d7d50e166c6dea6f61b13f95863

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