Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f05cf76f0b4b58e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 01:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f3a9b4bbc670e3eee7d5e2517cd96dd SHA-1: adeff200b34b27d53c5c03a0ace1e304217c5c86 SHA-256: 4f05cf76f0b4b58e6fa5fcc334f3134b5af231995d4db5361b11ced8c0efec6b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm hosted on disposable domains. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://texmet.pl/userimages/file/57160732191.pdf
    • http://axiomestates.com/userfiles/file/3973468875.pdf
    • http://usairsprings.com/userfiles/file/lakolapafudufizapine.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/53164880533.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9cf67402---27820244449.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b228e18e2d---suduwanugo.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/wewasemajugoliwer.pdf
    • http://yaqeen-eg.com/userfiles/file/90261070673.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e6c1b227d---mukojezifosutapof.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/75784563314.pdf
    • http://autowagon.it/userfiles/files/16962308910.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb68d54cdf---60038433874.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a911ffaad5b9ef0c1e3e8d53f74824ee/46988558707.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/subisun.pdf
    • http://rjt1.org/upload/files/760283609.pdf
    • http://barcelonasixtytwo.com/userfiles/file/65131655897.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q09piavmcqhos6gj96485oc3qs/3824750372.pdf
    • http://emachn.com/data/attachment/file/liliziloxixipilep.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sol1nool2f75ao89gfvt486009/vepesoteteni.pdf
    • https://xosobacninh.vn/webroot/img/files/68660672343.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/wanor.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354271eedd2---13396675649.pdf
    • https://www.profiemg.cz/upload/ck/files/56249096773.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=modul+praktikum+mekanika+tanah+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_off0000d344.bin
7af74e0dd5051bc125d2fc8bc1f577238babb04a999cb55339cd64d136674b2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 10780 bytes
font_01_sfnt_off0000ebd7.bin
150e3472b71d362092e58fb6971a766512e6782d3d329c3582e5c38627b86d3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 17416 bytes
font_02_sfnt_off00011989.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 16792 bytes