Malicious PDF — malware analysis report

Static analysis result for SHA-256 761d3a7f291e0bed…

MALICIOUS

PDF

97.6 KB Created: 2021-08-12 23:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2290308a7fc3401c7fe0279c2282afe5 SHA-1: e61b823b146ea078bcf3c11f1e11552a12c12995 SHA-256: 761d3a7f291e0bede7ab4b065f4395eb363542b1817a140d21a78c0b0fe9ac77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5acce72e1---zokefobirixezif.pdf
    • https://viratrip.com/basefile/travelasreviracom/files/xuvenovag.pdf
    • http://www.medicellbank.com/userfiles/files/47736480475.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/vekasovaj.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72acb1aaca---futorotigoz.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tesosazegeb.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafcd9c9d69---64699390977.pdf
    • http://totoquynhhuong.com/upload/files/74297986361.pdf
    • https://777mto.org/contents//files/mipasesisu.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/tijejuda.pdf
    • https://angkortaxiservice.com/userfiles/file/92797811100.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d2968b9a911a9441363f8e27e81b92ce/70804254206.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ccd277d7---47270688638.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ccdcc42953915a170124f9af1311e373/safanobikopabuwa.pdf
    • http://box8websites.com/ckfinder/userfiles/files/zudakuzagozasemoga.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813acd2476b---bodusemudeledik.pdf
    • http://nsdadventist.org/FCKData/file/38691976975.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdb181b4c---78318335195.pdf
    • https://assistenza-termica.it/file/25109387537.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f49743397a6---6436946326.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4ffb44dee17a4cb226e14ae1aa72b736/donijesexatiwituk.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/63b20d9ac6a9eb5f76dcbaa49d225acf/kebedajuvepelopuvasirig.pdf
    • http://zavalinka.by/var/upload/file/80070198685.pdf
    • http://austintownfitch1980.com/clients/879833/File/84961318316.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=alfred%27s+essentials+of+music+theory+book+1+answer+key+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_off00011442.bin
5e988580f4962cd7ac572ed09435168745a5ad0178c8553a7fdfa832394c69a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 11484 bytes
font_01_sfnt_off00012f35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 16792 bytes
font_02_sfnt_off00014747.bin
8179547a5c643c0079af04c6ea7a020ddbdd2633be1fef01670ece2d6eeccf6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14747 19224 bytes