Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8bd83e9385462b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-20 09:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f60b0f00f921d9c71f90546229c9505 SHA-1: c9a146bf7921a43e846acc0eb514868abb8f2be4 SHA-256: ae8bd83e9385462bc9c864ebb0a4a1f936a054df551b94cefd5214d991b1f9cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=drive+for+speed+simulator+mod+apk+hack PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5e08844c---tewigigako.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/25933599619.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/felakomufixa.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sejubesoz.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632083602.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/bugul.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/3842647272.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/43927235461.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/duxazimiluxu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/sv8tc7l4libg0djt6r7145aend/xerupobenodotovuji.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/luxifinagisegof.pdfIn PDF document text
    • https://bachson.net/upload/file/rudepador.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fifudolizosejoj.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-20/20210920063434378020.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/19031970057.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/dijiluxitadodami.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b970505b66---84763791749.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gajcf5ght0uskgn93vahil4k99/xusivu.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/supenaxiz.pdfIn PDF document text
    • http://vejwun.cz/images/fozuno.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/xisesasu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/19918999727.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/rozezoxesebodanefuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF43 14456 bytes
SHA-256: 51c1caf83eaa3661f80a0e879cd6beea1a46b6fccaf3641c87d5e93903bcedb4
font_01_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 11040 bytes
SHA-256: 4c6d24ac802a6b27e9bcd0cbf62fb4a33e3d91f34365aa3e5c6ce4e0bf2ba8eb