Malicious PDF — malware analysis report

Static analysis result for SHA-256 852dc3399f42a588…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 19:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f928e23b774ca2e1662b8912cf43cea1 SHA-1: e5a5a8954c517b31c41c0955c757d75433131321 SHA-256: 852dc3399f42a588509120887db86897f0408e054b5ae7c85177673513174d35
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 as a link farm, with several URLs pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's structure and embedded links suggest an attempt to lure users to external, untrusted sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://sumbulefendiegitimvakfi.com/resimler/files/kiranudax.pdf In PDF document text
    • http://podhoru.cz/userfiles/file/nomudifewaxalogok.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/5606906364.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/pepevizedekoliwevupodi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d882c9b7da---danolamugudolad.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/12468526576.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/nefuxezijozufume.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/16129863004.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c4380a23---bozamabilurepulutitolix.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/pixaxes.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9db7e48566a2fddf28da806bd572b589/80569101438.pdfIn PDF document text
    • http://dakmet.pl/upload/madevonomaxafiketifufexud.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/14574233656.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b3e3dd836f380054c0ff416080a5534/73437872442.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae2532acc---89297723230.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/96441754352.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d9c6909fefae419731b2e0ed8cf14d4d/lixofagoguj.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kigokozi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436440900c---welosozeb.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/liluxevolebulorusewisoreb.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/87366024630.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec416f50a---zitolewekujudi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13f16e34b---30489966732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=modern+robotics+solution+manual+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 17588 bytes
SHA-256: a07e30a50047b027f7722b98bbd8abef608c6d1c3d1817ee5701b18f16878abe
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 11012 bytes
SHA-256: 01758bf624f0402d61ab8dfbcfc6d3e71545ebb136fafee82ed796c551c4c04f

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