Malicious PDF — malware analysis report

Static analysis result for SHA-256 126a77df5f034c48…

MALICIOUS

PDF

87.0 KB Created: 2021-09-03 11:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4e637adeedab91232ce9a8d86049903 SHA-1: 89d8819b9c39b48b3e192cbb39ef7a7395844688 SHA-256: 126a77df5f034c482d4371ffe036cfeddcc730c61a1c262989699efd742b068b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on potentially compromised hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39b4040a6---14015656738.pdf In PDF document text
    • http://fonnepal.org/userfiles/file/55916473974.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/70637421741.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/52640714305.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094befadb735---58678136125.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/joketefikefumezered.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/wawofowatub.pdfIn PDF document text
    • http://freeski.hu/freeski/file/81028162554.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/91696419636.pdfIn PDF document text
    • http://palami.by/images/file/vurepufemuzogedolesofusur.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/26152851179.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/29f90455874856a3f67374a8d7bb841f/zuzemo.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/29819154340.pdfIn PDF document text
    • https://rajakedua.com/contents//files/repoweti.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/xidomiwiwewokozok.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/papizumotuzuxenavafe.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/boloxugenusup.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/13505308522.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/putesixotugegenarigukuk.pdfIn PDF document text
    • https://zestus.us/admin/images/file/soxodipipe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a50118c89d---62848818034.pdfIn PDF document text
    • http://cudicio.it/images/file/tenapolim.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cdcaa2e7b---lipitonemulelos.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/ranuvirasinij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=architecture+drawing+tutorial+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 19616 bytes
SHA-256: 1d1897db9c2f693ed86ba7eaf3f7612b933339464d83123c36d5356acab5d9d3
font_01_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 10896 bytes
SHA-256: b2f678a54f560d470d34c71778a560e5f6ee4ee13a01132929fdf6f9fabb00c5
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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