Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a10fb279f279655…

MALICIOUS

PDF

76.5 KB Created: 2021-06-25 16:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94ef9cb8eb782f70ab01638da57de148 SHA-1: 4c9847cc1e71ae632baf1fbdbae525b0e95347ae SHA-256: 9a10fb279f279655c288ef1b569dbf5c730b7fa3c1b809a85f38028703c1514a
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to exploit user trust by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://inwebjor.ru/uplcv?utm_term=how+do+you+determine+if+two+lines+are+perpendicular
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707915d9970---koxanokokiva.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160987f505c741---laduferidivijusat.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0275faedf96d87f7bf8d7edb769e210f/97536540206.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/50a9593e1a0c002f700b5f222b3aaba7/28435033992.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/31hkim31j8c3s9l0spli8t3brh/70903565740.pdf
    • https://marljivo.hr/userfiles/file/pilokotus.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1p9dqldaemqb7k5vrgou117eq1/43930652682.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/g40iuopbbnk44egh9jevruqs33/pufufixepi.pdf
    • https://anthonygillant.com/userfiles/file/vujimat.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/eaa17eebc20f5511b1f9a639d1c367a9/25215150701.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a691eb19335---toxedazokuwezutukedatula.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b949094ad---27635045359.pdf
    • https://foundryindia.org/userfiles/file/betegariduderenakilezaluf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d6.bin
07dbe165330dc5c7d99f07d61c6f5ca6ea1b873a10c901c3bb09b4e2e2117959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 17204 bytes
font_01_sfnt_off0000f338.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
font_02_sfnt_off00010b4f.bin
bfb2dd54d0d26e7d50b84adbba3872498a9ceb9761d703b2a4f771101365e595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 11072 bytes

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