Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99685d7ddae19f5…

MALICIOUS

PDF

87.3 KB Created: 2021-06-25 23:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23a6542625a7c5b410fb0e4f20366e5c SHA-1: 5105796e8734ac441709082b885a20cabb8075a3 SHA-256: c99685d7ddae19f57111a61ac01973995da79ad484dc1f97402a33aa1f8e9053
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may leverage embedded JavaScript for redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b59caae8d2f---97670777164.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907d58534c7---manezelusupepakesojenew.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874c737516---72051882628.pdf
    • http://exlluprimebrochure.com/ckupload/files/mutib.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e44f85a76---67623361874.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed14c2e11---92556034978.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a283b191---35496893998.pdf
    • https://carparts-fixture.com/file/file/1562156392.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9685328198---dirupasiwaxusufikus.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/079c0a1a07c850e7c0377aed8332b22b/11234719263.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc530644f6a---xageguv.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/12bbc2b76e1a1968b892f635ecd4987d/mukirumit.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e4303618---ruluvixobevixefitefejasa.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e552da98---nobowazavik.pdf
    • https://terminal.hr/userfiles/file/26069697955.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/59668090747.pdf
    • http://tlxzkj.com/uploads/file/111354158975.pdf
    • https://vibangnhadat.com/uploads/files/72545309687.pdf
    • https://baxsporthorses.nl/userfiles/file/70284470964.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e8v56ugds1tb5aqmp1o5t57p89/vuzoradu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/skastbpqmjh54sh62n77rcmcdd/40302497175.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sbgknr7ifngjcsb6feeuemc6dr/86141096638.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda19a6cea---81462269190.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=1st+puc+biology+1st+chapter+notes
    • 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_off0000ee9b.bin
7bffe8d049b0c3e6b32cc8f4306d02f4a5a0d8749da06fe0a468a5b5613fd19a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 18976 bytes
font_01_sfnt_off00011eaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 16792 bytes
font_02_sfnt_off000136c1.bin
4830a516bb8c3bb0d8554aac3f1d0e2a35291777b22167183be81403dfddbec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 10960 bytes