Malicious PDF — malware analysis report

Static analysis result for SHA-256 c373ef7b201bd190…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 12:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cafc7b21da28b49c8ff1ae8aa2ab62c5 SHA-1: 7cc321c77f93d4fe89b52bc68edb5c75cb038cac SHA-256: c373ef7b201bd190e0c422e9b1c8db7be7b5ee173d1708296e5de45429e4e119
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=animation+video+maker+apk
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/11beab78502fd3790cd1cd9c49a0093a/62239204082.pdf
    • http://purepassion.pl/userfiles/file/89432292162.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131c85e77aff---68340704086.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae22ba76d3390b525eec4d7ab16158e0/bijuxelizulerowod.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/743bc4e0ae88a3e52bfad0abff900c88/soxuzerusulu.pdf
    • http://przedszkolenisko.pl/userfiles/file/28581477235.pdf
    • https://fentesmakina.com/paket/upload/files/19793327613.pdf
    • http://vrajacreation.com/uploaded_files/userfiles/files/ragekasibulawejewuz.pdf
    • http://cuahuyhoang.com/media/ftp/file/gabatuxaxapananixerujeg.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ca249dab8fdd613176e366b76701b953/vukegefonituxuralifi.pdf
    • http://tinhdauvietnam.vn/upload/files/zelekemivolatat.pdf
    • http://namjapizza.com/app/webroot/files/26541310939.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a4ab24503cb02e7ad2d994a9a3852f9f/51734054780.pdf
    • http://studiocastigli.eu/userfiles/files/zonig.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/13408182342.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613715a5c3b84---virawetekupunaferu.pdf
    • http://hrt-foto.hu/_user/file/38227125547.pdf
    • https://oriolefashion.com/ckfinder/userfiles/files/94214131693.pdf
    • http://szentistvanpatika.hu/upload/file/29052244554.pdf
    • http://cpspcb.com/uploads/files/44888528560.pdf
    • http://tourgrodno.by/images/content/file/82672699435.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1562026eee3b5a7fd814b9c902042a49/57513105179.pdf
    • https://bosgo.mn/uploads/files/52973958802.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_off0000b0af.bin
fe27e023e38700c4c49c5205d11bc16217132a1cef5edaaa525097d0c6487225
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 10476 bytes
font_01_sfnt_off0000c877.bin
bd32c6fee6c66a1f34aa05801e7e69bfb487a5aa9120f3fecd8efac34ef45fbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 15428 bytes
font_02_sfnt_off0000eef8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes