Malicious PDF — malware analysis report

Static analysis result for SHA-256 4468a9da7f9e8562…

MALICIOUS

PDF

77.6 KB Created: 2021-06-11 06:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 46579e103aa4069cc5f7203679991806 SHA-1: af5bbd203487fa54767cd8159e18c63daae97c92 SHA-256: 4468a9da7f9e856216a0781418f2af6471493dbf21c9ffa93442906ef8e2fa21
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains terms related to game cheats, which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

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://wastran.ru/uplcv?utm_term=last+day+on+earth+cheats+android+2019 PDF link annotation
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cece3c139e---34844593395.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075855c1490e---tefafifukijepogudarokim.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d5958b6df79c0bc095ee53b9aa7321d6/vulugizo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca06bd494d---jeravotudixilatadafozov.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7c8649dcb---vumebekejejogevageve.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67c8e7833---tovakij.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2428aa0b0---36963198738.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/45065489052.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf0833c1b---35538658968.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/ruromanajumezo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d0c63773---xoxerunugezaxa.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/161efd59e358b260434888ae13d66052/sexizinuraxodobisizuvi.pdfIn PDF document text
    • http://learningkey.org/userfiles/jenoloxixizadaperij.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec2fcd82a---fusakubutewe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 5520 bytes
SHA-256: eb5ee070f0cc86d5276f4d7183fd582dc88f59a85ce4943c5fb9dda7011afb64
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 12344 bytes
SHA-256: 22da8dc410f8115c108c55d959baf9114af2d674f2aeb5f4e4d31e41ca60585f

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