Malicious PDF — malware analysis report

Static analysis result for SHA-256 f198c24cf942cd45…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 20:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78b90400e82cd49ddae0a0ed13d47145 SHA-1: e39d2e74ee276ab2c08c140acaecb01a608445ba SHA-256: f198c24cf942cd45817e0aab741bd628338523d5e3d76afc2d450b360af9a70a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to potentially compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=57.3+degrees+to+radians PDF link annotation
    • http://mtegl.wsystem.sk/userfiles/files/zajukevawuderex.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/juxotosojaletop.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/25191729482.pdfIn PDF document text
    • https://equimat-cheval.fr/file/67484516446.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/58686554023.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d138c38c8---pidujep.pdfIn PDF document text
    • https://ghnservizi.com/file/16688562920.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/matuzowiriw.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demidibutirukolaxuse.pdfIn PDF document text
    • http://brukbet.com/user_images/file/lexapiwusediroju.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/49283318753.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5fc1c48d5e7f39e6776a88736ba45fbf/2698942650.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/4250729428.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7a1897a575f5d8c3648d8120bb4c9c6d/zexalubadipug.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631197821.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/57721907526.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/42126381076.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/81720297738.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/94096640540.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/42472284450.pdfIn PDF document text
    • https://tebra.si/userfiles/file/jugorumiju.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/kilerurapoliw.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/borirebekikuvewen.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/29136594309.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/domebines.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10704 bytes
SHA-256: 34690644f981e703f2d30fd3a9ff46652e12c0ce03154de7140821c8be369574
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 18848 bytes
SHA-256: 9ee516240a72ba03f6decd7b1aba1c9cee195358977e3fd778cdbcfa103d515b