Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe341ff155b07b01…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 08:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c9afb26d9c64f5de58c5374dfc11804 SHA-1: d546e20165fc5599d7c9da3bc5f690393e8a3b4c SHA-256: fe341ff155b07b016fc1a05a0643748427b9112b7d8ca2e0718cff32b38d5088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67c5a9a3a---wikale.pdf In PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/20464941849.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kapifiwiz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f400fd2944---mijagugolepelewexu.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/44914347228.pdfIn PDF document text
    • http://beta-rc.com/upload/files/bulefokuwitapimemobozomu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee21a04c9584ee676216d1f7e590ac85/favibizet.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/24555621243.pdfIn PDF document text
    • http://ccadl.com/files/20210908130144.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/gikumonid.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/39318300437.pdfIn PDF document text
    • https://laser123.com/geektic/files/1867856623.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/bowusifi.pdfIn PDF document text
    • http://kyea.org/imageuploads/63023818949.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/4581864041.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac27911e6---napuzex.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nibamobexawejitivibozosek.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/varotavopenomeg.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fuputokaru.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f700471b---58494041624.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/laxuk.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/81019370406.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/13415477024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+phone+games+to+play+with+your+girlfriendPDF link annotation
    • 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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 11296 bytes
SHA-256: 1b6b36609f3149c6a3d38998a3941e8ece51028fb95f0d211578a3b5e54a783c
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 18340 bytes
SHA-256: f0c1a9df18fc114c6bb0dcaa4dd3593d996e5b27e9895eff2fe559b35076cb13
font_02_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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