Malicious PDF — malware analysis report

Static analysis result for SHA-256 297a3e5ee4ff69af…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 10:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81db15993bd06c89a6f66e6d9bfc4083 SHA-1: de65aaeaa6ff44b4c750ffdb5339c814c983c7c7 SHA-256: 297a3e5ee4ff69af9a9f66cb23b0b204f9f18ca8dcb68672b5eb4467d8a07914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=friends+season+5+episode+2+watch+online PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161384ae465d6d---serexosugafelevovix.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1595f536---zumuvamil.pdfIn PDF document text
    • http://sartor.ru/upload/files/jimusidetamapefuguxibates.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/radatuvarowulukulejus.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/79031674740.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/wapasegazujunolusa.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/96329691115.pdfIn PDF document text
    • http://clingac.com/d/files/pizaboluditopopeku.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/90274887.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/83553130024.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/45818946988.pdfIn PDF document text
    • http://iltorg.ru/upload/file/98870661753.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/donuninofoleler.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/dasorubanoniniwerotol.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090907275573499.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/muluvedugadiwi.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/80486017055.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_213827_9641.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3f2f12be1---92561887410.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/wizopokidef.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/3832891540.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7fa6d3f1---dizomapedazerodepivawebi.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/85084631161.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/65201468361.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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 10928 bytes
SHA-256: 4fb753c6f2fae2025828f5895d71fe06296d0150535aca0f67cd6030ecdb12b5
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 17872 bytes
SHA-256: 63472dfd3103ee3c13207ac7123e6c61e4275c12db1eff7f6dc05aa71b40995a
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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