Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae549118be159979…

MALICIOUS

PDF

60.9 KB Created: 2021-06-23 23:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aefe1e160fbae308baf05d87e714d802 SHA-1: b948a21a958a0d9d8684c4ddd4a997964f1d3bea SHA-256: ae549118be15997902e26d5f530e0fccdf1334ddb14cd066e36f0b56c592a2dc
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 0.9812

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://crysiq.ru/uplcv?utm_term=single+variable+calculus+8th+edition+pdf PDF link annotation
    • http://kppzp.pl/userfiles/file/rimixikotigonuvanuten.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4915c439e3b69fa909878a8ee7f4a707/2917760580.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/92fecf9b5fc6bb5a995169d5df4b2060/jumijibejoloz.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d70c96840ae3069c9e73f3e8e93cb74a/ximozizon.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d8158150---9166373191.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66cf55648---pipurig.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b2b68f0fa7054afed162497d5489318a/sobidufikuwikakorurupa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8174e965---fonixotazipotekiz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be8e48354e7---21707494139.pdfIn PDF document text
    • https://activepymes.com/pub/file/90472967346.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/makafawa.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210526184607.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/be9c193278ed4308cb041f3b181df385/23574905633.pdfIn PDF document text
    • http://chongros.com/userData/board/file/44621115191.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zafetisopoba.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d74e08e8176c18330130b5d2ffceaf26/66347088456.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9e5a2df5---sovibefiwaderi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac2e48903243fbe01a202bc8d671dcbf/tutikalelo.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_off0000c33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33A 5912 bytes
SHA-256: c37fc9f279ce19289c65a37a2fde9e9b79905c8a70e531e2a64751fd7bda09e8
font_01_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10448 bytes
SHA-256: 0aa64079ff57f71d2703db57700d7ad067500b846360a5b8de2a7dddbf20cfb4

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