Malicious PDF — malware analysis report

Static analysis result for SHA-256 8168043cb9b7390d…

MALICIOUS

PDF

65.9 KB Created: 2021-06-20 23:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5f647e231dee9929aaf83f0326dba687 SHA-1: 4042c5cc0f90b34697bc6cbd533a3915ed68730b SHA-256: 8168043cb9b7390df2df7d2f5eaec7701ff60baee44f2faf6fa132636f410602
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a malicious file disguised as a game ROM. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=super+mario+maker+64+rom PDF link annotation
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096b43af0149---99388587535.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8385884b35---17164693534.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/597cfe9f977a4147159176681bb6e587/zixomopotadesiwu.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/6307323075.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16089dcaa931a4---61861406444.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zuxufubenotes.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f10b393c---sodagovogoj.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b7e2b1178ac62ea1cf1d8d8d93f6bbc3/29485923206.pdfIn PDF document text
    • https://cristalensi.com/public/File/bufuxupapomowaja.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/99332143192.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/14046496495.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d1315884---samepamaset.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676182dad---59360733515.pdfIn PDF document text
    • https://areicon.com/images/file/karijilusiretewitoneno.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f8f8cd19b118ca9219815d35303efac9/36267437283.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/22684433403.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tabinivulubenawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 5164 bytes
SHA-256: 5505c6f117ab4a0732c8cc5a64e81c289ff723696811eafdaa3df4da503f56a5

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