Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18ef9b1f123c178…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 23:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70ff9666a7c087dc5042d17abca0de64 SHA-1: f16e1e65eb1fc9e5dbb2703476bbfd6e0dab4bb1 SHA-256: d18ef9b1f123c178c769736bc8338843348bf237c9e8060a0f00f0f8dd42c737
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves luring users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=traffic+and+highway+engineering+5th+edition+pdf+free+download PDF link annotation
    • https://ptkas.com/kingkong/userfiles/files/52190511858.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/96526416184.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d2c96c8a---sivenu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea34971f14---65940193628.pdfIn PDF document text
    • https://limsurdua.com/contents/files/dibipuzifuxiz.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/21555637194.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/belupobip.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/vojupafilufotiwomorube.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/85934947484.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/rupedugetodakagob.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pejanipewavekakowe.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/fetiguvixig.pdfIn PDF document text
    • https://red-adlay.com/upload/files/98235533790.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9s4f5q7crv4u9gpaoo9ihjre75/87603829718.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pasireralibexizuzabekusa.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/nizagoterakolidatufisaga.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/55794310654.pdfIn PDF document text
    • http://kasargod.net/uploads/file/25028070437.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4g2ecmeclr0hjb1ci8hvm1q9f5/21908593866.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/19359767745.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904072805715263.pdfIn PDF document text
    • http://keitbg.com/images/files/653833449.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/50449584939.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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 18028 bytes
SHA-256: 8bdf3cd0099b4ec09371f1089ecab5efbb44d8fe172c37038b69d08085d424d8
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 11028 bytes
SHA-256: a3d07a70f19eed31cd55880e1388546b3c9bee181b3c638e414fcd6dce2f4212
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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