Malicious PDF — malware analysis report

Static analysis result for SHA-256 1097c675844ca514…

MALICIOUS

PDF

100.5 KB Created: 2021-06-25 12:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8397093abc965a3bd63602b8de622adf SHA-1: feafc03febb7bdb2c94913e7f88cec2fa665b873 SHA-256: 1097c675844ca514ed1115e89ef4def53dac738df0e4b920d15309ac07266386
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these redirects. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=semantics+in+generative+grammar+pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a7de3a8e---33038785678.pdf
    • http://erdivigado.hu/userkepek/file/xijubatuvokafaziwawepiwi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2bcc152c---23649338704.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/84e1db4a64fd0f74f2df813dff057b3a/34517909828.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/85be579e0837c6c47ca76abfd93d8771/pamel.pdf
    • https://narimasu-chintai.net/jcfiles/file/duzidugezumikagiw.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e198073b5---90422597239.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ibh7b1iirka0cv22rqhs3eoe9d/kasamone.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad38426fdb3---fifubop.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db88f5ab10---zaxavido.pdf
    • http://wolfroccatiassociati.it/userfiles/files/37397272165.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb87b3799f---90288194785.pdf
    • https://chief-moving.com/editor_upload/file/38628941354.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609754ba552b8---17008004590.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bb8a24dd1b61bf423a6f27cf0e9e7bb/mejogubuzamuvabugigi.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_off00012513.bin
0bea8d3d376419ed98235b3e2e86feb4b496b83c5c4ce6dbce2a9257b87ba29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 17904 bytes
font_01_sfnt_off00015406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15406 16792 bytes
font_02_sfnt_off00016c1d.bin
33a8db4d26d1687723053f82f8f10f4daccdd979b5886a9046a30db850dc3ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1D 10936 bytes

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