Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fdb719e8e5ce72…

MALICIOUS

PDF

101.3 KB Created: 2021-08-09 23:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe9c8743a7e76c2c67516f987f4ce7e2 SHA-1: 9109e30b15d77960c9eefa7997a589d9f12f8037 SHA-256: 17fdb719e8e5ce721e5c607ebd85bcce7046459800fe2cb4821efc53a8cf6a82
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://gps-ambroisie.com/ressource/site-image/files/9378828006.pdf In PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/8639bc027773cb711ecb215800b60a59/79385450528.pdfIn PDF document text
    • https://lemanssrl.it/file/26232349615.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lefekifelopenamuje.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085812b05313---tadusenil.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/95323642234.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090946db1251---rojukibigusevitujufiril.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/65243032976.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2533a1f22---26816547552.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/11393116066.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/bujiv.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/padl3jn0khrsrnro06uclmohc0/26602034381.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/74103860952.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102e053cefe9---kakuzuz.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1300e65996---5656336934.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b554c77e4---65047488769.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eef702e4---nifidofikux.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1db4345e105d0cce80efd0dda9b8a812/6309564760.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/47672413900.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/39568271520.pdfIn PDF document text
    • http://greenbrier101.com/userimages/38562616659.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba618d441---91924537412.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kirulixafozazoxodet.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8db1c27d1c---72652763366.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3783ceecdd---najomabeziguvujejezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=como+saber+mis+puntos+de+infonavit+con+mi+nombrePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 18220 bytes
SHA-256: 9ffeda1a15940aedfeb9f9e57d72851c3a456b0b33495e87dbada00a615cd285
font_01_sfnt_off000159ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C4 11072 bytes
SHA-256: bc2a1ad00fbdc41561b555443fe86814b74095b02ecd39339addfdde5e6c553e