Malicious PDF — malware analysis report

Static analysis result for SHA-256 4753a45a3980e2ef…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 05:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a63e90e5666b119c4aebc6e549319420 SHA-1: a62b0a38f65f32e5443d305c6aa498d124ae1558 SHA-256: 4753a45a3980e2efaf0d2941effe90aa07e586654e908bced325376ac4bc0193
154 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 0.9063

Heuristics 5

  • 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
  • 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=midwest+us+climate PDF link annotation
    • http://domario.ru/userfiles/file/powabusaruzobejamila.pdfIn PDF document text
    • https://norservis.info/files/files/sesedumo.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/nakebaxavedabawusijav.pdfIn PDF document text
    • http://woykoff.hu/upload/file/wunemigi.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/54389798130.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mouf10df2bme939rn5hqmup5r0/galozogewipunibibixeru.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160af4464374fb---kejoketamajalefadonoxi.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/movigosujamalikenakib.pdfIn PDF document text
    • http://chayka-svg.ru/files/47930787290.pdfIn PDF document text
    • http://meskerjager.nl/media/files/10111878848.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/jilevemupogadekebopavu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e9bc3d104b7d91788d5161b7f5ee5e5e/rodejofezos.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/jaziregumizurukoxala.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ba6ad79cd2909f7f512f07729c12db75/wuzufidodofowebofofaluraj.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/229901680697d1e2548f5eddd0b4d6a2/saxodixediti.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/76469036261.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cade6de5f4f---jefutopuvuxomivafajutanag.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210724_145535.pdfIn PDF document text
    • http://usmleworkout.com/files/file/debexoliwup.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/70867045576.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/lizovedepunonozapanil.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4j16rke572fcdm72l2che0ete2/44976695264.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 17104 bytes
SHA-256: 953801550a6cb5825fdd5655cba90c6ba45aeac90e2fd489edddf034d8fa5fd7
font_01_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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