Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf93808e784af75…

MALICIOUS

PDF

97.7 KB Created: 2021-06-09 21:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f56120ca5da29e11d218d10245a03805 SHA-1: 4f1e693d627c7a05d76c5e4a36e61d26fd84b2ad SHA-256: cdf93808e784af75a58ab8f736aef61842d8cfe56a39a124db58682558f30f27
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=gloria+diaz+miss+universe+1969+question+and+answer PDF link annotation
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2bb16c3346e19ca311f11139957550e7/42642613209.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/80084218949.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0802f566bd0f36b80060b44b0727f917/2107614340.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/047e3c46abe17fa00694f3d02037962f/32331744716.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/de14f728d6fece5792d253f24e9b3aaa/73392153169.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5e794b63a7a7c7a929b3c5b0efeb74b9/mufurezeguweb.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5c9c9794---nugigad.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4df0f693---wejujexima.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/331c59a0846a74f5cbf91514707eaf56/64791837509.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69049b2aa9247fbb1a792851770b3335/vowesafarugumapikela.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0d5295caca64a71805fe5768b1b062a5/57744434294.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee9eace5b---kiresuxerizeregoborafe.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/wezadonumopuwoguted.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/60024445846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/7815821632.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • 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_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 5692 bytes
SHA-256: 8ba25fdf5a721dbcbad61d057ebf1339ffe97d0ffdcd457a5f786945cf81b6fb
font_01_sfnt_off00013cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF9 11732 bytes
SHA-256: b94a4ac17f2020f3f066410dfe29edf6a544d3a18fad6eda9881fd13a2e29e60
font_02_sfnt_off000164c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C7 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb