Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14b8a9df6d48e69…

MALICIOUS

PDF

144.6 KB Created: 2021-06-25 14:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22d3bd1370d09685c52ea6ef3b692b17 SHA-1: fbb2b1a28ca50d495c4425163f0eff313a9e6949 SHA-256: c14b8a9df6d48e6951f2b245726e1d9ce6c3d1aa1bc82f2a1905b993782cdcaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://oniceh.ru/uplcv?utm_term=two+properties+common+to+all+electromagnetic+waves
    • http://triatlonbizuterie.cz/sites/default/files/file/dumamibirulefuzagulun.pdf
    • http://gemculture.com/userfiles/file/webifunubixe.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20eb087ac---dapeguf.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/dutumidujibokakif.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/239247925dfbddc14ad295a8dbb75673/57913457101.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608032a9de099---mawuzarixazunej.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/73358317882.pdf
    • https://gazelletr.com/userfiles/files/29713183771.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08de3c583---nuzefisafexet.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/7qlcehgi6nqsggabm6l1h7m6j3/kanasideti.pdf
    • https://makenie.com/upload/files/37199424462.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720942ec4ae---99702592893.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3569c1bab---74939405844.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607273db26fb6---93199157053.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e157e586---luledijupute.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607960f5c28a8---javamov.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_off0001ccaf.bin
e36bbe1f554d5c2c1b1d542538301835178fd5be04b223c9a2c4af026f1e2de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCAF 20884 bytes
font_01_sfnt_off000203cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x203CF 16792 bytes
font_02_sfnt_off00021be6.bin
d15e68eaaf02a6d2eb0c827b222c880f96b83d27584058513f3ab4f1e4115b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21BE6 10832 bytes

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