Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa661eaaf176594e…

MALICIOUS

PDF

82.3 KB Created: 2021-06-30 12:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aebcfd0bdc68f964f8da3dfb72676810 SHA-1: 727ecf5cae022a59ea4b662e32e6e5ec95dee7e2 SHA-256: aa661eaaf176594e55051efda33f9ac40d922e8eb2a2909560a545759feb7e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=war+of+the+visions+apk+mod
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/56686c0ff2ebcff017a3bc0dbb49bd9d/93987955682.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ade38597fe0---detaw.pdf
    • http://asja-doll.ru/userfiles/file/33249615072.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e443fca2---11276450136.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7bf75d03f2582792d2a0fd32aa6fb011/43382687833.pdf
    • http://animationcoach.com/userfiles/file/luduve.pdf
    • https://bnbcostaverde.it/userfiles/file/neduxoseberopufiwula.pdf
    • http://mxm-hosting.nl/img/editor/file/puxugexaxadowevapaguvu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c9756c064d778728a76a6f275822949d/13130470381.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41d5de2e3---65999529511.pdf
    • http://aczelzalog.hu/tmp/sopot.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd263cf2f6---siwifaxogofeli.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/817860a26a9626d13c00dc6a8f8e7c53/tefawibususuxevoti.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tv95o93ttmuffplon5i6g300d0/15678766453.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8b634994391971a831f6a3fa0764fb7d/32026362477.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c8646421---bajepapitu.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/322c9331b49042b54065127e10dd9031/66086114810.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074983d71d9f---2022591986.pdf
    • http://officinedesign.it/userfiles/files/23457570001.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/ginezokurasek.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9ea3d8b3---kowuxupowej.pdf
    • http://aryajob.com/user_upload/file/72415183514.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ciab1mlhluo7l1emek71ij949l/10551517326.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_off0000df5c.bin
2aa682f88ea5191e8179946903b0e6a50b64e5243e01d310a667450decbec3bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16736 bytes
font_01_sfnt_off00010afa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16792 bytes
font_02_sfnt_off00012311.bin
f1d2671bbf3b6ac175a8ebc6d256f4d764f87fe91615028c5bb058933d7c7b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 10868 bytes