Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb48a5d3745d432…

MALICIOUS

PDF

92.8 KB Created: 2021-06-30 23:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e37a807f5bc25afab7b717508027d6e SHA-1: 450ca779f07b9ed3989285bf6dee503c829f7061 SHA-256: dfb48a5d3745d43207c0c103a0433614074a4da255d33b3db3f67ed9cf9bab7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as a lure to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=his+secret+obsession+12+word+text+pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9921aef6cc773d85a9ce5e23b549513e/8766679927.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b847fdc318a---fagujodokezixewowesa.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a52bdc70c---fuzakewosuki.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/f59847726724115bba470078940ee9e3/46282034579.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf02c0c4f7---zekaxuwafejenu.pdf
    • http://badaranquehablar.com/userfiles/files/wojukar.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8859beb6a8651c6ec9961b97be1366af/36761676062.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db702a6fe---64259949635.pdf
    • https://gachbinhduong.com/upload/file/fetinowodu.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d2c0d7ee9f16ece3c9fea52a9f9809a4/fapej.pdf
    • http://lungshingcentre.com/userfiles/wixojubisat.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7d0dc453811dc9700975f45b16808700/mewegerakabu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757dae3eab2---jiriguxa.pdf
    • http://creptiles.dk/userfiles/file/sakopuwatakeragewez.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/roneluxubodewerulesur.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ca29a7dfff4aa91037c3ae4ae518eeb7/70038584961.pdf
    • https://gaziemirkentkonseyi.com/upload/files/ruvitunojufopitujogu.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/365ae287445142458289e800b65748e9/jizazuneraba.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/p2pgbddhgod63on8g02to53791/vivorutetagukivetoguki.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf6622ee3---subiwejisexifupejekosos.pdf
    • http://alhouti.com/userfiles/file/5167905699.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cefdd8df9a016baa10bc4511fb233062/godatedasaloxezetute.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/116aac5d619f47279e4e5f0107d9616d/sugegowab.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/609fa42c6bb39ad2d752edb5b9c7d164/milekivezudepuwemokomika.pdf
    • http://airfa.it/userfiles/file/64699206804.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_off00010660.bin
393a3b4bc71e23e063780f1d4b9b9f76513e01555f89246c9ec8d272490bc648
pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 17024 bytes
font_01_sfnt_off0001327c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1327C 16792 bytes
font_02_sfnt_off00014a93.bin
b7f540c1110880ff56b839bfa4803f71cf66dfd854731010b5ad76c48584b33c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A93 10896 bytes