Malicious PDF — malware analysis report

Static analysis result for SHA-256 19976fe950981c2d…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 01:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cf4b11fe2d3feec6b630e8df9ecf5e19 SHA-1: d9dcb5968ba56ca2bb2b3bb61e8e94ca3058a86e SHA-256: 19976fe950981c2dac797f26125c78ed22535c51a8c4b793ec36d36b42025b1c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9077

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://huntic.ru/uplcv?utm_term=off+the+deep+end+my+body+different PDF link annotation
    • https://i-chat.tw/js/ckfinder/userfiles/files/gikakatadosowe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9cpn9m3opvskivegi1uein2qa0/47559388195.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbac876675---pudazelobedox.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/blgheur6pq3i8jlhmp5nu74k85/sinubalovite.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad3c5b039---gedepepojinevasulub.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/tipak.pdfIn PDF document text
    • http://edgecs.net/documents/vudal.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/17442995965.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/podin.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a295e2d9a---96862395257.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/38433312547.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/xugozirukeba.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/55b94f473beafe9b9751cb6f8e54496d/90707676771.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r93i13juhurug5ni9tbhqfutul/2975022431.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/91108546890.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/vasabowojuj.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/mewemejinopewisinukul.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/90018053990.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 10668 bytes
SHA-256: bffe17a09dddf432ea2c5967826c7af1930dbd39d4cf78ffa15460d13f8ad2cd
font_01_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 19080 bytes
SHA-256: dc50b5ba8eb5e4db5661df4729848914b3480c1883d32206a09efac0021b1cca
font_02_sfnt_off000152ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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