Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb50a0d75bc9ab82…

MALICIOUS

PDF

93.0 KB Created: 2021-08-05 18:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4b936969a31ecb70f408ecef8e7d442 SHA-1: 8a42bf369a09803a1437e0739e6cad6ecfab3789 SHA-256: cb50a0d75bc9ab826ac8968d94a7db6ad893a6f0ea63a05cb231e8c3458d4916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URL distribution and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=can+an+orgasim+cause+a+miscarriage PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14db78aef8---94518394480.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/89719850272.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842b29b2edc---bezazifirovijafisururoni.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/81369285705.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/oea3p5n33q4nl5ts8a8uqoakp0/27048270931.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/41k23ccbj7vnih6cj3r6q8luo0/38001062646.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/kijino.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/vamonebogemozuka.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zusuxo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa329d6e0---30786763094.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9afb849c31eb1aeac355048ee0c30f9f/47610174589.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078108d9b102---32669282477.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f7d00cb1---zabixaratova.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-10/20210610000113227708.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a5dcdab29837eaf54c5186722a52cef1/reduri.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/35185029735.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/34215162235.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/85468552668.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/lowodavisiwurifesi.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/60723381236.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5eee4297e---8340301626.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b518feaf462---55307023242.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_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 10560 bytes
SHA-256: a4f7f6150103335e0e9c96a635d241e265cbcaa9c5862d4cb19b39bc57d81ad5
font_02_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 17176 bytes
SHA-256: f88d1a6f6810533a23cb3780ec86f31f03aae0a1cf512c32d7420e84b9031faf

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