Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80245ca86f5eff7…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 16:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f2c0bfa1efbcd4afc314224d08e015d SHA-1: 63ac6feb01e9929d63b681227d77609e186d924f SHA-256: d80245ca86f5eff7679ac978f67f6a5337d3ef2138ed9969823ac4e13240145e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0ef94c5e6---60918432416.pdf In PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/muzajat.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/worobadirevud.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/45526356265.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lurexejegujisugusawenuzob.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/rofetelisolafen.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/730892603.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/vedopu.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/92060614583.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/93087286473.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/41788174370.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/80173329584.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16140b907dcc81---89059737253.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/531570322ccacb15d852716bdbe87eaa/nufebapagiluwotekiwakux.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/3689756359.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/82825259979.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/91524687324.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/pikeridibi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/70t09ead78oc0i85bvcf2v04v0/76224647650.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2e385bbab31abb2034d58d5b2adca058/nigajinapob.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/57324570716.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/95536839898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sip+on+android+phonePDF 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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 10252 bytes
SHA-256: a3730f7ae7e5bbe0f7dec8628514be9ba7686ee32e1164690d726937ece75b73
font_01_sfnt_off0000c560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC560 16636 bytes
SHA-256: a1c98a06203e7c5aabb4e2a06aecd29227172f5b6a0b12e056ed2167f5636d91
font_02_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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