Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6438dd2e365873…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 22:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aee23fd8a3c8d1c289e351f3f81bf1af SHA-1: 43ba381fc4edcf8920c50d7df637796d44b51a0f SHA-256: cb6438dd2e3658735a21e7dbf341179ff0052b25ac625575be561ffb37271cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a large number of URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of 'utm_term' parameters in some URLs further indicates a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chcial.ru/uplcv?utm_term=project+management+competency+model+pdf PDF link annotation
    • https://anfauglir.com/images/file/zijofamubigi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/nazinu.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/86493271777.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/94d92cc1f0963f0b87b891f418492676/vukolubeviroweki.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/27bf8e972f0f49141ffe10462b9123f0/1957966866.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210824070418.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/69d32b012af144d297ad358d558a2b4b/70917345629.pdfIn PDF document text
    • https://melz-feu.ru/upload/wifezaferibupoxiwatitulu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9f044ebad336c41f9b13724d14e9abaf/87112961555.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9ufduta3du8l8cf93fpe93sq0c/8775999652.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/35c58bd2e18cc9528e73d19687facf78/vofitajuweramirenumugupu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8998a0b10a---wawinabinuf.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64601254798.pdfIn PDF document text
    • http://gabortech.com/admin/file/18964285356.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/68318838139.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/xemerekugumifab.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc315e7a3---veluwegajekas.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b544d4f838---pukanozojiduk.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/93520465077.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3eb60e41d2c711812b6d8a03accbda69/2633367183.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ckjcg93dg589dc2juck5qo1ifb/vedunoxuwutemugusijoduro.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_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 10948 bytes
SHA-256: 3c0f2d4e6c7d60413d264c7b392cdfc281e67be156155c2834539a036c9a81a1
font_01_sfnt_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 16624 bytes
SHA-256: 8fcbf5c6f9aac33cba331967e3880ed48542e107d3f9d3e1afb713ffba5689dd

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