Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2f3123fb70d305…

MALICIOUS

PDF

90.6 KB Created: 2021-07-21 04:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d8e9ebd497ebd06c975fcaefd6f1c62 SHA-1: 94b722ecabbfd0fb1b09e9c228cf3ca7a76762ec SHA-256: cc2f3123fb70d305dcb82a63f115b93b7dae2e02e9f598b8ccac399a7a2f19f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, suggesting a link farm designed to distribute malware. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to trick users into downloading the linked malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc3361079---liluwerizimopu.pdf In PDF document text
    • http://ozari-ua.com/files/file/melibejebidat.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/55842184088.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/divenivegebexedegonidizav.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c570aa57f---ledetemu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160832db72ddd8---85584267004.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/fosududilaxibegiker.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160840d7d677f7---56511531028.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/11794118969.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1672f18651---kutomatina.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/19138280595.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b90640ac2---13579568805.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/retokinuza.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/namapoden.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e75ce2ba1---64983304678.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/899e132dc334070f0dc496294cc94821/befezigaxiba.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/7013523569.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/34330464599.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/55852620952.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q6ai2jo4tcb4j5t5v44n63j7f7/matusubavaparelabexaven.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d3861666---pojoxadajozomulam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=foreign+resident+for+tax+purposes+meaningPDF 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_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10976 bytes
SHA-256: e6f6df7725e73a6bc8d62f9878f0f5dbe3c12a80a7397a7881eb7864f9421a97
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 16652 bytes
SHA-256: 899752424a826532f79800e8a95123e10c02449deb4c6d0312a6d6fdf3a9ed58

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