Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a5690b65abd99f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 18:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a98c59e8336138bf9823901c6d7b76b SHA-1: 82137b9e3e393d28eee5649156237377b52df010 SHA-256: 95a5690b65abd99f1f9ac96cb627423d27f487d402f9d173c9d5a8121c257685
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage. The PDF also contains numerous external URIs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. No specific script functionality could be confidently determined due to the nature of the PDF content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://circuitoinsulargc.com/documentos/file/zedurapud.pdf In PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/bojalar.pdfIn PDF document text
    • http://babamoleskine.com/files/file/furibedetonevul.pdfIn PDF document text
    • https://lorus.rs/files/96403369027.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8f20ece1---36196774831.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/67518613954.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/69967961858.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/bufakurawape.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/mabekur.pdfIn PDF document text
    • https://sambelteri.com/contents/files/xebavejupajojevufejozozul.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/puvumunabopove.pdfIn PDF document text
    • http://aquatherm-graz.at/files/29363025823.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pobad.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/nibonagijab.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/ligipepalifobokuwa.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/62578573024.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acabb328da---sijimizewuxujajuto.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/vugipovalawo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/36649653803.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qeuqhlm3nvn08a1itg3c8u3p4n/lobuv.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614afff01ceba---judawaxaneritosivenud.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/kewejonadekopagutanemov.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614760414caff---rujukugesizufojekuwujem.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kudud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=summary+of+great+gatsby+chapter+7PDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 11164 bytes
SHA-256: 0bcc6a53a3104cde599e94835c165de1ec2a7c8de1ee86a816cf9707592000fe
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 17704 bytes
SHA-256: d86065154a2cbaab62dd995989a16bd3736afe3b2cd62c89cbe274958e7673e1

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