Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9811b2ac11e2fd4…

MALICIOUS

PDF

69.6 KB Created: 2021-09-02 10:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a29198d0ad01d501725db1c51eb0bec SHA-1: 87ecd6146bd2ba80e96d40e5016d24b3ae432a47 SHA-256: c9811b2ac11e2fd489b15b50db68aa164294de0fa0f0ccc465a56475dbbca1d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ou-ravda.com/ckfinder/userfiles/files/zumirejepebedijimibusigus.pdf
    • https://hyosungulf.com/uploads/file/28762768095.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e917d29aca5e08318fa947f6d855f699/34927852741.pdf
    • http://edbiji.com/uploads/files/20210821153414_255208.pdf
    • https://noithatkuongthinh.com/uploads/files/92045673529.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedad708ecc---8314429819.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612041ad453f8---16700937294.pdf
    • https://etonbio.com/newsLetters/images/file/76738212597.pdf
    • https://deniz-sogutma.org/img/userfiles/file/91807292749.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fecef31b---kitafewosigekonukopagifov.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758ee40b1cf---gojumumitobome.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/055866b04451aa7b03f4445a7f6b08df/31947038651.pdf
    • http://vtvxm.vn/userfiles/file/tobopamupaxob.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/98784237393.pdf
    • http://traslochimontalto.it/userfiles/files/78581385541.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/rl6ft2sck1fob8sglu16salt14/sufuzarukirine.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc0d3a05f1---tifevivivajelizoxed.pdf
    • http://doktor-okonski.pl/uploadimg/file/38811349850.pdf
    • http://bassbasement.org/userfiles/file/987962389.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1d944d6c---22983286019.pdf
    • http://vogiantinhmach.com/media/ftp/file/78216858147.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=listening+answers+of+crime+report+form
    • 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_off0000b197.bin
a950280f77955c90f987adf4e3bbddc0a4352eacd8ab1b3f00374152e48e130a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 10820 bytes
font_01_sfnt_off0000caa7.bin
542129254071d6168247f86b475d60f4f911a3de46dc1402dbb116b894856215
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 15248 bytes
font_02_sfnt_off0000f112.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 16792 bytes