Malicious PDF — malware analysis report

Static analysis result for SHA-256 579aba188632f27e…

MALICIOUS

PDF

129.3 KB Created: 2021-07-22 16:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 274819def34b52ed4d6cf7abee43945b SHA-1: ff0fe7325705f0441d28d90586f4ab980b9be93b SHA-256: 579aba188632f27ef0e78834e47902efd13c5cc577188f560e6aeb128bb4b7aa
154 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use form-builder plugins for file uploads. These links likely serve as a lure to redirect users to malicious content or phishing pages. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9537

Heuristics 5

  • 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
  • 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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9181aeaa---89318181301.pdf In PDF document text
    • https://infypos.com/infyposcms/media/52516767796.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/sezawamenekorutimovow.pdfIn PDF document text
    • https://starbox.fr/img/files/fenesav.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d082f6a621---16094943745.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c1986674---88879169255.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/loli8gtui56phe5gjh93bqu7a7/rulazi.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1edd51311a281150f109515d3a679b99/parixatikepevov.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/20875696938.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870fcc76664---romagumupurabepiranixetul.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36b2a6edf7---34629464058.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/tuxagilogolaxolefedeni.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/5003823908.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/28008758797.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/98047843728.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/92876862538.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/3afde131d6ec11433f4fd51579f2d018/buvuwumogaberuz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a9a83f50dcea25d51d2ea8d8eef8949/sewawuwusibu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096720cc3af6---razorobitu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/91620982240.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/52901229168.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/wazubotaduxa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1dfa5e14---wumasuleral.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1191ab93f---39533279829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+twilight+series+in+order+moviesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5F6 18516 bytes
SHA-256: 49450c84179b685d1e521c07a07e73bbe765500ec09527d48cb540ea2a9dc2e1
font_01_sfnt_off0001d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE82 10648 bytes
SHA-256: 7e8a8cfa10776ccaa11e9cecf9c56270b26acae889da43d2ca7f0c958048fc77