Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ca5ce3060b1891…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 02:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d0d3488b423e3d76ad24c358ebd25c0 SHA-1: f5a640d7b7dc1ead644cd82f7914e9fa3b6568be SHA-256: f5ca5ce3060b1891ed4e38cc22d19b9b6601c7c69221745422230b89c05b7e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079084c6fa50---xepovov.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f4787f74---53631364420.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d4d86f1f91d873e78b08901fbeefe7db/mumok.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-11/20210611101505268518.pdf
    • http://ei-windykacja.pl/upload/file/25636618835.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffd6cbcb0---vawebijulewutefaxogi.pdf
    • http://campfirewtx.org/userfiles/file/wokol.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ccfc743de---tefobanutesuzil.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/600e95a02e65ea65e6941e18ad4fd7e9/zoxotakezanivutoxos.pdf
    • http://fresh-j.info/images/uploadedimages/file/nesisefub.pdf
    • https://asi-filter.pl/files/file/81791783456.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081544944026---92892124463.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4a98d0b7---wevilubofib.pdf
    • https://sardavetri.it/userfiles/file/37137988486.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f214f67b---68973117600.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4116b14aa---xolobijalokokido.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083040f691c1---jedirubijasogipur.pdf
    • http://kameleonhastanc.hu/files/file/zepavefixupamakamibiwusuk.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/p2ffsp6puqr83k490m2f5i1sp1/37126290827.pdf
    • https://amrapalispot.com/userfiles/file/nugojimakeguxijaf.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0338d0293---33874312514.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/50kbsh88f18jb0nngphbp14d33/bokulujoluvasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+power+of+waking
    • 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_off0000f414.bin
16652b4d41638e009bf0ff6d288f29af79f059808f6224f1be2ff8651d25deb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 17604 bytes
font_01_sfnt_off0001222a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 16792 bytes
font_02_sfnt_off00013a41.bin
3827981aef716a1a3963008b5d8008ef08f48421d0e13a2ccfbc6302edceef7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 10464 bytes