Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b1f58641c9ba16…

MALICIOUS

PDF

85.1 KB Created: 2021-08-01 23:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7ba2f68e39b3624a4b32f6ca0abc68d SHA-1: 0df7ca1ddae41a8c9c844b771f692874dce7c7cc SHA-256: f1b1f58641c9ba16340ec7dd9a4458a5dc9f10927ef88b39b4f2a006c582cfde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

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://medvor.ru/uplcv?utm_term=las+48+leyes+del+poder+pdf+para+descargar+gratis
    • http://studio-orlandini.com/userfiles/files/buxidonogotalevezun.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/brn3g5u0u1dt6s018kepbl8kkv/1675369158.pdf
    • http://neonatal-surgery.ru/userfiles/files/fagomed.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bbc9621878067c280da3625a7b3234f9/davikixojopakevofin.pdf
    • http://cathugo.de/res/wysiwyg/file/mojobikoked.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608121f4dff54---nekeronu.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73032fb48---51770052945.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082f132e544c---53335084753.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0929134e01---83719321604.pdf
    • https://delphin-bau.com/ckfinder/upload/files/xanozodevek.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e539657b0e---18568375458.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092165b7c339---xofolupepuwubetufozut.pdf
    • http://movementlab.dk/userfiles/file/gobuzawenixigewipudijol.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/86780307323.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210709_45D8102CD60BDFA0.pdf
    • http://btc-ltd.com/upload/file/ginonikubunemibumo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/62efafafe61da13d4d5c05098ec7847e/32496195031.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/xuxiperopilo.pdf
    • http://rzn-house.ru/upload/file/lekujakilagobezijawokesu.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fg854pdqrk4cr1o983n3flbj94/98325607506.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2530548ecf216612a7eecca406f41a15/89871630403.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/20f92d885f502b6214f87d59f21849b3/pisotivuxewufukunenekelo.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bb4c2c4b---buzetiwutenamu.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_off0000e4a3.bin
7617037281ba1cae6d56bc6775c7b9251667dbec4588150e2d8a2c61249cd077
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 11048 bytes
font_01_sfnt_off0000fe5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 16792 bytes
font_02_sfnt_off0001166f.bin
4fdb7111bb5a79adf5bfce461a34e934729ba733ff8630908cc2a51fdfa70d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 18028 bytes