Malicious PDF — malware analysis report

Static analysis result for SHA-256 d135c32dc4fd2318…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 10:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30b0f2c7b044c4380bf388602cdea120 SHA-1: 66d6e211f49bd445f872c1b04e50636f1c25feeb SHA-256: d135c32dc4fd2318668d6cddd88daf4d456e9502de3f64452d0efe20e8e1dcbd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=wind+energy+introduction+pdf PDF link annotation
    • http://cerrutistudio.eu/userfiles/files/50752702509.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985d7fa5bbd---fotukuwumotimulazolalag.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cc78fb66bb4f5fedc63bfa236d1f39ba/33932841936.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/84790751524.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/rudafopovajolover.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82c19c7f3---febosogufid.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609427fd4b0b0---75139142950.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/66473023776.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/7120620641.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/vaxilikafuvit.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8469d2f00---pujine.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7c4b10d499de1020df086d3773e26cda/vikodirubidurij.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/xuzosopurawirodo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7304895ee261d74e82de7b755765a99c/58299124747.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949753adb5b---34845592849.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7836eb91a---11478885794.pdfIn PDF document text
    • http://cecev.com/stockages/files/79636336948.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/zezebujojafuxepa.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/gerugiwaxezewumom.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a507c6bfc---82991089653.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizumewex.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/20490288226.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/78832820628.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_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 10628 bytes
SHA-256: 26c86c7d6e61c2f5b7d227e1b366e75f0d135359e1ae2c35b7d523420ef1afbd
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 16560 bytes
SHA-256: 1e104c159fd80b7c1ecfb17c876da4e9666046ba3e540ca3754836ed2cf49084
font_02_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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