Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ff503a6cf0c8aa…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 12:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a8a2b0384108e7a5c1e1cee47b7399e SHA-1: 99057ec20596ae817f19e1791ab8183172765da6 SHA-256: e6ff503a6cf0c8aae75b0917bcaae4ebf9e56c7b0cfc415440c068e8e0d81145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm indicators points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=essential+mathematics+for+economic+analysis+solutions+pdf PDF link annotation
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/558e3e848789975ee1f15a2e437787d7/jotaponexum.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160928b7d662cc---fujakepifidonadodeseki.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/423054d27106f1e60709a607fa2a8c18/45005114036.pdfIn PDF document text
    • http://schokozentrale.de/idata/lijemale.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/boxab.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f22db1a94b---19809415033.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/pininemijawobubipipus.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/mitejideriro.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/18508537359.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c61797e4500---81522086836.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/puxemiwufozosax.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mcs9v08ithpto85a5tfl9e7f9s/10615453881.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a018f1589a4---depubopixosiwazogojazud.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/15168505776.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/womozuzabuxavula.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/sifuxevodatugexiwimo.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/rasojanorulofemon.pdfIn PDF document text
    • https://icbacademy.com/upload/files/xineduf.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wubim.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/18608938422.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/sedukigezakuzoveter.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210811222705_4s575r.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_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 11084 bytes
SHA-256: 6c822af8b58eedb7fe3f610940e1c8415cd7ee32dee898997a6b093558ea7ee7
font_02_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 17096 bytes
SHA-256: 20308cbac938ed7798841de5d7c8bf0d9a64cd81686cd54ca3010af2f10c2262

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