Malicious PDF — malware analysis report

Static analysis result for SHA-256 6629e25fe7e59923…

MALICIOUS

PDF

92.1 KB Created: 2021-06-30 22:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d51e972c28e0cc229779fb98938a12b SHA-1: d538e0054021652a9ddf8ac501d2bc0ccdbe7783 SHA-256: 6629e25fe7e5992394d98a63a6ffa000ec9e06eef3c7f80ca9ca8a7b10d510d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/svulhc35eap4062v5ukbqf5bg2/rizetilorowegun.pdf
    • http://odpadykj.cz/UserFiles/File/99507393410.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cngph9qokc3f0m37f9pjm6orv1/95431790550.pdf
    • http://aire-limpio.com/img/editor/file/42234381643.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a8e4d8df---27058516398.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490a6dd43c---watijubajem.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f4f9a52f72a7f94dd64027439a20a81d/tetoxatefu.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fc225c9b---regofizexumu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09c75caf8---tuxonuwafotasesekituvis.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/63080254600.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5c6eb463a02d7df54fc46ba874d2a40c/rofuzomaroveval.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6dhgj23u1ejentjgp3n414ucjt/jigamowuwonipe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13715dbc4---tufezal.pdf
    • http://rideco.hu/upload/file/20861551876.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27741e5634---56268865061.pdf
    • https://austarpharma.com/upload/files/21285801299.pdf
    • http://altinay-law.com/images/file/pozefokodubimalugun.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/qc82gosk9i047ssc842cvsv399/govuwosajuwe.pdf
    • https://hogies.com/includes/template/uploads/file/pedos.pdf
    • https://echipamente-scule.ro/userfiles/file/topemulujiz.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b072860becc---woruzuzufiwubud.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8oqdrh2rbcrmt4nomjfnmg2jh1/549832065.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ant+group+ipo+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_off000104bb.bin
d601dab2be34419e75879674a82fb41be8193ffbe7cd0ef2a8d5928225ab8a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 10244 bytes
font_01_sfnt_off00011b9a.bin
9a60a9b0dc6def3f7dece382b5709e5786274ecd32cb3d1cedc753a6a8fe5664
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 18260 bytes
font_02_sfnt_off00014ba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA8 16792 bytes