Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5b409f3902573f…

MALICIOUS

PDF

76.3 KB Created: 2021-07-08 07:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa3d9c23b79c0683cda53d76465b1d09 SHA-1: 8171b47f8b51970429905a2761d67a2f71f86bbe SHA-256: 2e5b409f3902573f9ffa8e2d113039651b1e44aa82b44fb005e11f7edb7ca4be
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=battery+place+near+me PDF link annotation
    • http://abnicum.ru/files/file/21868795576.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/zivilakodalekediw.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/masogabidodewogupa.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/13906215931.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a7eb9dd2---ditusivi.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/kajovurisibujukup.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4uvqc3kmuqjgnt48ubh8h2qkvc/97438773717.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/marusukazikologixuxizesog.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/998dd0e1b457c4762ea1368850c8343d/76494470325.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dhva9hiu0p4q2vd7n74veji9vg/573913337.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/69271780813.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/xokevanegasemijili.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b477ab2e---8975638683.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/25220898231.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/37626788380.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ca36d600---93804195143.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160904e27f1b47---dinope.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c4dd713c48b7e8812bc2c6ba635ea77a/wetenadoxaparuworasa.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dazobiluwenimini.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191608.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/82429351376.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0c96c6da---tanuzijosivetakimaguvaf.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14cc2a374---48361199111.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_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 10320 bytes
SHA-256: e7c3a9492051011d4b0ca5776e7f3ed4ae8825d2db702f31d3a7fd38ff6891a9
font_02_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 16440 bytes
SHA-256: 5c760ca6b01086c6e3e148067ccfb5ecf5509e5a3c834134f7c82da850fda6a3

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