Malicious PDF — malware analysis report

Static analysis result for SHA-256 645deb4342e5db4c…

MALICIOUS

PDF

81.9 KB Created: 2021-07-03 04:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb0523cbcb727f28cb8dbc72e1c683af SHA-1: 8a5e413f65ed22070b68ba5050cd706357304144 SHA-256: 645deb4342e5db4cafffa6e6a9101879e2616f00357520c93803c579d3639d2b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and link farms suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kebuzusuzakokifa.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c4d429a3f---56698991209.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ec54b958---regutejosawokamekor.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f34206d7a---57577289781.pdf
    • http://prodottoitalia.eu/userfiles/files/30039107165.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4627887e---25192320170.pdf
    • https://minegociomiweb.com/userfiles/file/birapefubalasetotirijuda.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8526102f96ac3e524a9eff08b34cc98b/mejoxo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/o1hou3etdbukniqkicpvj6vf67/97124879859.pdf
    • https://divetechmarine.com/contents/files/22649436759.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c924689180---15558258871.pdf
    • http://wittlich-luexem.de/userfiles/file/56143817142.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d21d1bcee6---28099321092.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/30627a6a62f15d88136092c7d8f6ef6a/69110503881.pdf
    • https://dacinsara.ro/fckfiles/file/nupubalotokuxirimiwaxakof.pdf
    • https://anukulagrotech.com/userfiles/file/torid.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a47869cf619---27181927125.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cmjgab3sfak2aki4kd5trtee0r/66463141321.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1e5dbf77---rozefasinitisewol.pdf
    • http://piemonteforyou.it/userfiles/file/konurerimoduza.pdf
    • http://asbufestival.com/uploads/FCK_files/file/lonelumezopogukivofuvagun.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36434ec65---7716515454.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09723dcb60---375611946.pdf
    • http://a-mega.ua/images/uploads/file/livegokabebajasu.pdf
    • http://xboxheerlen.nl/userfiles/file/55471299946.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc243c1a6c5---99706282354.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=seminal+retention+and+higher+consciousness+pdf+download
    • 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_off0000dc17.bin
6e79f101ee20e11e215a350708669e0bd1f310d10bedaf0cbcabbecdd008110b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 16708 bytes
font_01_sfnt_off00010746.bin
df9614a18da5dad5cf512b63b7bb4dd47ab4fa5aa5e88a387cae2411979393d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 11328 bytes
font_02_sfnt_off00012187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 16792 bytes