Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8bd61d0275eabc…

MALICIOUS

PDF

77.7 KB Created: 2021-06-26 14:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49717f93db081dfd7cd4e9f435ccd5b3 SHA-1: dd3ae3a4af61f055f5fd053a9697f1b93bc10e52 SHA-256: 2f8bd61d0275eabc8f70f6fa2fac48bc2df4dae476fddbe26ea4bf35baf4bc74
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://huntic.ru/uplcv?utm_term=algebra+structure+and+method+pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/06e25752838f20917cd502f3a83f87a9/64326796771.pdf
    • http://kp-technik.cz/ckfinder/userfiles/files/95858877833.pdf
    • http://beiks.info/public/file/94672747854.pdf
    • http://argumentua.com/i/file/7352932377.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/31b112641e7d9a39aba42cdc4deb4afe/78045174355.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f66be4589528cbc8251097c45621451/mulaxesus.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3f606e556e96c19a438b999eeafea577/14692338794.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1akkmqgf72jspjoddtd44ub0s4/74766218371.pdf
    • http://fine-cottage.ru/userfiles/file/kizemalosurut.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d23b37985---30179229118.pdf
    • http://pagyesa.org/userfiles/file/20210609205300.pdf
    • http://ekhoron21.mn/uploads/files/2528036659.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/65470510856.pdf
    • http://praconsulgroup.ru/pict/file/zaritogejozalevad.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/k4naol42k805ml35ftibk9fpq4/54286574142.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a95afa6cd26---50096669975.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3f9452a7c852c887109bde63d5968d9/kipogirumik.pdf
    • https://mimpiindah2.com/contents//files/96764417319.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f32c0394---teloxugu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ea7366d4961595f669f87b7fa56638d8/55145294835.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7a1c0e96c15580e6631de24b9a2eae1c/30189359786.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb71de5dbc---jigimusot.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/44b19009a38ba4a78f48192502cb0b05/ligix.pdf
    • http://beloezoloto.ru/userfiles/file/fitasenodivifof.pdf
    • https://llsindia.in/FCKeditor/file/jevoxibesi.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_off0000cac4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 16792 bytes
font_01_sfnt_off0000e2db.bin
a2443b3f8b9ac432e6079f3015edbeee39864480eccbf780dddf630b1f51c8dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 11196 bytes
font_02_sfnt_off0000fc7b.bin
b846edac54ee7acec2f63ddb2991594e6e90667dbc58ab17fefd57626d1e9361
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 17080 bytes