Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ee89b0bebe5ffd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 13:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59c953fe01eea163c3be8897d7e4ddea SHA-1: ab5a7af6ad23f7fb789656fb46a4fee9f4de4d30 SHA-256: 19ee89b0bebe5ffd5b81134d275bb2e999df0bb7c9c9984d7d8c8ebe5c922080
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts hosting PDF files via vulnerable plugins further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1c65c3bf5ab57d6475188dabc646ad9b/29731008607.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/798e4db5f35354195c115c1b6fb93c60/80204946548.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/veteniredus.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3eb2d565e---firuzoruvanusotabasofekup.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc83130f3---zidozu.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/bajavuginidoxija.pdf
    • https://empresa-venta.hr/files/48843114266.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1870ddae85---nufazalavufetofepariwipiz.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b663d4d7a5---46713325537.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1611f52dd20404---93574680826.pdf
    • https://rugsinc.in/UserFiles/files/daxemizulizesegozow.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85e69c3c8---8003412054.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4b65c699---bomebutazapujovusa.pdf
    • http://msamericapageant.com/clients/873634/File/27856730330.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/molebufolitibodaziravo.pdf
    • http://gocep.org/data/userfiles/files/mejizenixusufipevose.pdf
    • http://icmasistemas.com/userfiles/files/lepeg.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dc1ac593b0321b368791e2ae36f90704/samani.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c9091e0cfb5d699700fce17ed4750b82/19164131508.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edef07e98d4---9821384165.pdf
    • http://kammed.com/userfiles/file/mevuzukadixefopasorixo.pdf
    • https://aartipalette.com/userfiles/file/47751510698.pdf
    • http://nextgt.eu/uploads/file/valujevix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=physics+waves+quiz+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_off0000df57.bin
a4b6496855b52dcaf1a6262a053b81c74477ad494f2dd43dede1a9d7f9db75be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 10824 bytes
font_01_sfnt_off0000f85d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 16792 bytes
font_02_sfnt_off0001106f.bin
a92eddacfd601602d971ee88e9c9be3d5067daf0e3afecf5a1b5576f338c2762
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 18404 bytes