Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2444658951cc990…

MALICIOUS

PDF

76.5 KB Created: 2021-07-30 22:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01421d6f6721b4aab7a6462ea299096c SHA-1: 8e63e586f345925cfb495323321c038386616837 SHA-256: d2444658951cc990d7102a75d571d6396cdbae3016341811810dfb903e652ba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, which are likely used to host malicious content or redirect users to phishing pages. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection. No scripts were extracted, but the presence of multiple external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=kpss+2020+lisans+matematik+sorular%C4%B1+pdf PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac28f8d65f---tapunerotojobuludipol.pdfIn PDF document text
    • http://allasclub.com/campannas/file/mazumotuxirusebul.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/bevowejozakiri.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zazopiletabis.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c70b292c1e0a19b998addc575ed7b8ba/1879627636.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ukbf1l7uns4hfe21681nftb0i0/74195812030.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/9a45a5dd7aca61c59e598a4ba5111707/lageloweriduvupixoweg.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/wonako.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be6cfc184d9---pitan.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4e677a1800acdd755738f0e8919715cd/vesepunapipaj.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c702b44a7c8---titapobidun.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/feloligof.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12051524342.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/65929635973.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df406ee599---wosenogok.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca012cea63---sevajukaduwubunejezoj.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/25149751839.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/segutufejapufolezuxebimu.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/725875125.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/oqnuajcl3urse5ip22u6uq7hub/rulixawuf.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

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_off0000c2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 18420 bytes
SHA-256: c5f897fdc43af3e8c86c69c2df058dd7930bff752734c6c96cf940212d634ba1
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 11128 bytes
SHA-256: 0076024baa2cbe56236ab8bfa14da51631b7a14032fa6f1d8eae58b80b323fc6

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