Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc978e1d13ec5dc…

MALICIOUS

PDF

86.8 KB Created: 2021-09-21 13:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: af61def4d0a78dc81bda731b6eeddafa SHA-1: 13888718f8623e7d4665f55de4b690e41126e505 SHA-256: 0cc978e1d13ec5dc31cba08336e0f8145496f031a2c841da35575e689be6f6f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=mobile+torrenting+sites PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4b53eea8---rizupivenuzuxarevukosix.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/31281674700.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/jomisumis.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/valet.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/17500884665.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/8804253659.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/juwonapametafajobataxezuk.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/45561756381.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/14434038704.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cada03b7e2---palezifejuramixon.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/zamutufixudiwegawajexibu.pdfIn PDF document text
    • http://tchid.net/userfiles/file/tepever.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/megizugunojuganijofodokav.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/15523629611.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/tasopumex.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3884433f858850afcfdfc0e07984c8e5/28258881737.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/64583441021.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/24780573468.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/77198986836.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vge89cid8fnint7qeh4bc9hnt2/xosagexuvos.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/wumovozemakasa.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/mitavotidizisopokap.pdfIn PDF document text
    • https://noventa.cz/media/files/file/58886735537.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/86117406475.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_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10252 bytes
SHA-256: 8f34c6df024b8a19a0f062cbe60adb95b30cc4802bab7e33eb15e18fed275a36
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 17468 bytes
SHA-256: ef729a7d09f8b8e4af919ce43cad1457ba3fec3c72b63f36089348550eeb913d
font_02_sfnt_off00013551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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