Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49c72e469b184c5…

MALICIOUS

PDF

63.7 KB Created: 2021-06-21 19:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b37c7d895bdeb4cb273ae35681e26d3e SHA-1: 871d820568afd1e5996d9f1d0f9a67b1c19c97af SHA-256: d49c72e469b184c5155c0a8ee3f15cb5cf2feff74d4bb28aa5cda8ce2940362a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9554

Heuristics 5

  • 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
  • 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=zelda+wind+waker+iso+europe PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3c872c94---sogojejowosabibadi.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/47357464065.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/fofukedegedize.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/009c1d4f16e5f95e669e86a8a59b06af/76568376702.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fg8mt7ehp43s7ff03n61qaq3k4/silope.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/wajiporigaboxuligo.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909c5ca3ab---zubunoxolotetug.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfcffad55d---zowegasiwezike.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ce65672c---segekavat.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/75685149589.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/fuvofubolugor.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210530_BB7469D9D2F2FA7C.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/82856072745.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c6307da24f81e8a9662d840502eee262/87488246598.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8c6e9c3fe87de59b1ee5c741f28a8a8/wadujofufujixu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c06fc4f4b3a35d6ce1bea060c0435372/2683367102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 4028 bytes
SHA-256: f879e0f0c45820461042715ca438ab7f984a24c805fb836cc94796a85aec5d16
font_01_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 5068 bytes
SHA-256: cbc422a4aa0306b70fbe1077ba58243216ee52400dc8ef82db402ee10a4678d8

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