Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dbf659d34af2c6…

MALICIOUS

PDF

83.6 KB Created: 2021-08-28 17:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 406019e8b797195fb23eac1eb188d238 SHA-1: 6c3078ffe3e0cf704de19f644c2534f30f963aa6 SHA-256: a8dbf659d34af2c663fb03efd043649e13a1445e7109ef0aa532861a059fe6d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://medvor.ru/uplcv?utm_term=untitled+goose+game+how+to+get+the+bell+home
    • http://riskhedgetech.com/uploaded/file/158010107660cdeec667a1c.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612061d781e81---57691420057.pdf
    • https://pakianco.ir/data/image/uploads/news/files/vejededejaxijatelokabo.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/maxub.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/rugururulibu.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e666a8de687---21557595233.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cac3219e6b4d5bf3dc3979178173f128/32288307517.pdf
    • https://artbynela.com/uploads/file/36601641093.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/48496107590.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/69692835603.pdf
    • https://pomacanthe-art.fr/imagebeforeafter/files/fonirudapipuvuli.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3c91f2db---93009537376.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1001ae0c9a8ef9c8e58fa8d13ce9cc1c/gufizixo.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/65786810207.pdf
    • http://shopphutungmayphat.com/upload/img/files/dapogamatonap.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f09b190ab---migamalifinigiwuwodexaza.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/61621319395.pdf
    • https://pypconsultores.mx/userfiles/file/77262900641.pdf
    • http://deforma.it/userfiles/files/31969188198.pdf
    • http://jonme.net/ckupload/files/jafobeta.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b037f07ded05b5bec9777221dcae24ab/juxuvuxom.pdf
    • http://duda-tech.pl/dudatech/upload/file/58608455743.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bqlsav3gaup8ndj18pe2l1c0b3/41526699925.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b5e90747bb34b5eae6cf408ebe569eb7/94898132713.pdf
    • http://wsm.hk/images/uploadfiles/file/89689888639.pdf
    • https://baongochoa.com/upload/file/saxegojomepelopox.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_off0000e0b3.bin
9582d895dfc99c5ae02ea4f9ac26967b96b87c198791a9eb80d721185e973219
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 17764 bytes
font_01_sfnt_off00010e89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 16792 bytes
font_02_sfnt_off000126a0.bin
6705f371d6d0f95adb3f8ef464957e0982da67f883d941678cccd7aa73fad999
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 10828 bytes