Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ac7ae7ddc0c172…

MALICIOUS

PDF

88.6 KB Created: 2021-06-25 21:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fae255dfaa21049b0cc86ade37d1645 SHA-1: d981335b9a761b4b3b9d99da0dc5ce44f0d94e3b SHA-256: b1ac7ae7ddc0c1729fef79d96781ca4d397a002e8d429bd5154ce32a76b6f49b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as redirects to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to host external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dnn37pd2k7b860d4kvkecqfkt9/likidezofukoj.pdf
    • https://ivanda-commerce.hr/userfiles/file/fatesejiridumoluwa.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878a8b412f2---88894464780.pdf
    • https://toolsatool.com/userfiles/files/95835961640.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f080397f5b---25050974651.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/j8u5hmpee92nnk4jvotrhtljr6/48955048250.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d7eb5e64---17806737059.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3tvu937im898u6tgh1aedgju4c/zosujawula.pdf
    • http://poltinka.ru/userfiles/file/21922916778.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8977a0cf---81907474601.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bdaf79fe06b26f067d5638b5247f9b67/6727527752.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609327d6cf822---roxorogopazuwefuko.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/2cfc9690b167e68d109c178e30a135bb/52524728729.pdf
    • https://namlongadc.vn/uploads/news/files/zofitavusegeneleforeli.pdf
    • https://vvpta-irvine.org/userfiles/file/zepokom.pdf
    • http://epoxidice.ro/mm/file/depawojupixiwosujozojamax.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/s3397p9f8lnjh1uuotungligv0/43977901860.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b5650da9---61588118008.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ec1537c9---nafabopodaniw.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ptg311k1kabmr314fglcnlr506/piwazemujurulonafamokav.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e7890dfc9acfbdb909abae0e1bcf088a/20663066392.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/didotagunutevivebixosisi.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aefd8e0c6---manad.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609657da8bebd---wakopunopowuzas.pdf
    • http://alpha-cp.com/userfiles/file/65185177164.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1cf271fc3aa62008304734f9c7e82ea8/kemapojibafalawurumovizon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=simple+interest+worksheet+i+prt+answers
    • 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_off0000f4e8.bin
d9493be13c68f3d3d7d750c46f7403134403cc3cf2b86d377e0029fe207bdfcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10768 bytes
font_01_sfnt_off00010d83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 16792 bytes
font_02_sfnt_off00012595.bin
615a61a29a8b502592c58e766a43bf68310edfa11084821e21fb6d10b1a3c968
pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 17848 bytes