Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92b9f79167db3d1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 11:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23661e1604b95d810768110e4a555d39 SHA-1: 8dc978864cd9dfa5be84cb2f8a4318e7cbc514cb SHA-256: a92b9f79167db3d1f324dd96e66f1aa8b5023a1d638c4f67fccbae47cae7e54e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or SEO spam. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=fibrose+cistica+pdf+pediatria PDF link annotation
    • http://mientaytourist.com/uploads/files/medozumimataremitozatinux.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/rekinuf.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/vuxotowixifuxogowogo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16075fece7ec58---malanutofozuxuziraxibobo.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-15/images/files/14123128638.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/pusorofizu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/6066665618.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/30119782495.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/27a025c8be327096a44bf107d984c90d/48898150196.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4153698e4---mulesiwinokizobumos.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97cecc6c7b---gemivuj.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/24205889472.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/35802403729.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ufu70mhlrdflev1duu6m5l92f7/25314074674.pdfIn PDF document text
    • http://fteq.ru/files/file/nokafuporomopijuduf.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16129f04e9e5f4---tufalimizotijekibedagutu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210710_FEA77264282A000F.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/32135646304.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/rokobodawoxugefidoxerizef.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/natotapapakalomas.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/lanozedivijeludono.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c184c1d75---53852120909.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5d0b047e20f242c3a3a7809825819e7b/detiredofigananojunun.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/16238386442.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/48219296283.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_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 17976 bytes
SHA-256: 6f4fee93701c8bf1cc45872b092cfb31cc6c13e787dd7b675411dd2c7d656c4c
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 10580 bytes
SHA-256: 3208e9877ed230bf09348c19a68854094e3485b00b8323b7975ee5bb67b471ed

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