Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9b241541863545…

MALICIOUS

PDF

81.8 KB Created: 2021-07-30 11:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9a49791cadaa5d0a5b646607ccbc0fb SHA-1: 649e7b75a097fa7fab39f9c2b0b7ed7a278c8407 SHA-256: 4a9b2415418635452a2e3d513da4389382d8f02461366e19d38a95ed2ba1c457
154 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 contains a link farm pointing to various PDF files hosted on compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5329

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://budohurtsa.pl/userfiles/file/81454597032.pdf In PDF document text
    • https://khanikango.in/file/wamaxufuni.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dugububupezepilopezem.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/16402794441.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/jegapodumopimosifol.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6f6f1576b---72952777935.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/721581066.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/386fa3a955a970177f09469fa03de683/werujimokixa.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/marokubuzapinigiwebinofaz.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zozajitana.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/68v81qs1tkog7tjqf6o9jot393/zowibupewemiwusoziraban.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b96613834295012d886e7cfe58fcd9e/73405780017.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/07adaa1e15bb00966b21131531dc35b9/vevezalogitenunil.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507120034635152.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85af7d384---59294958739.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/50695877905.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/45543345985.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/111f6e9335be2215f888f26345474957/fusukubufixakejif.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cadb22f2024---wakobuj.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3b71db64881d40397031c731bec918d/navivoferu.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/69138d3a38d1d2f5e5a64c8448a219a9/xigadefazozolenokerep.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p4gmtkm4s5pt0uifhs07h0i6gp/98476480132.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/xiraxulij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grand+theft+auto+vice+city+stories+psp+save+file+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 18688 bytes
SHA-256: 3b57a93eb9c4d3d08b4b9153af42284998709849d186afb21cb908c5dd576d48
font_01_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1