Malicious PDF — malware analysis report

Static analysis result for SHA-256 591ac9f44a20cdac…

MALICIOUS

PDF

91.3 KB Created: 2021-08-05 10:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e7c582333d6d03f4c604fef635c228a0 SHA-1: 01f51097c6b87b1c203ebe2ac35c9a61d5d21a7a SHA-256: 591ac9f44a20cdac03c1fc592fcfddef4d6e6ee968b2cd261bf204515fef6de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=how+much+are+avon+brochures+uk PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5b9f95675eaee596e8c8735252725250/2410070375.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/93871699918.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be448f68e4f---dunavaf.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f4b6d7f2---35093962414.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/radewulev.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb18963f7---puwifozefi.pdfIn PDF document text
    • https://teamcode.net/upload/files/47702293812.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b9610fae---gedarelar.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/dewusixivebofenor.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfd9bca09---rogikujobazapadisejide.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/1684518412.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfa77c79b---17926669511.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/tugasumagigumixawoxir.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c42b51f8f---jozodet.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/50285680552.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/79827646788.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/gelojexawu.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/mamivo.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/gefetibikibofix.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xaxitowevunapululokupikoj.pdfIn PDF document text
    • http://wernitznigg.at/files/23747643021.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/46236180561.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/988ab78e3e6645e12f4766281a139f59/88661153698.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f637a59d81---29750883721.pdfIn PDF document text
    • http://matras-devison.com/upload/file/42666494449.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_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 17896 bytes
SHA-256: 229de3a3dcdc8545025caaaeb1384b9944057cd5042473c4b9c751f7f0524bdd
font_01_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 10732 bytes
SHA-256: 445fc2ff46d2d0c45aef7925e8f57969ea4e34af0d25d3211b761fc204e6040e
font_02_sfnt_off000144c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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