Malicious PDF — malware analysis report

Static analysis result for SHA-256 f669d79307db73f0…

MALICIOUS

PDF

93.2 KB Created: 2021-08-13 06:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2bb7e9fd7c24ce24812467031c0a8700 SHA-1: 237e3bd54a6307a91747b52d5d4eb7dd0bd7ee12 SHA-256: f669d79307db73f0b77797f23daa70edec0d7e53282d0e69a541d82b89bce460
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 0.6155

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://chcial.ru/uplcv?utm_term=smooth+criminal+glee+cello+sheet+music PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3a3215813f6fe2a5cb218ec324fef5b7/laleverezigigopatobaki.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cb5e16e559cf29a9914d259c777981ec/rabaxinomixax.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vcf6a3ok9mnt0tq8gpp94tc5t0/80935708458.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/rurexololixuzu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/29701641454.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2209f43b99022fe4be5d6eee8bf0243d/6375671075.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/bemitufojemebogujepim.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/77830939835.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a8429964---91800701211.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nepan.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c237ba4f3b7---43196936445.pdfIn PDF document text
    • https://arerp.kr/data/file///pisanejilojozulonid.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lekevumoba.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/maputakizadukigogilem.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9e386506---7637428161.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c667146a---19363396531.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/puvesetagusaduzivevenozu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f27b2fd079d1aa19bc23526cde624ba4/93159754323.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/74577498149.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/33373565539.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/su4ugvgjagbgfqpk72cg9pnk0v/60287638372.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/88121190921.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tq9h5pdn0tnipo9bn775kvopl9/89166744474.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/67442075181.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210709_044130.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/00938c1769676db77cf13bfde85b3052/pekiror.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/57878253319.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_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 12360 bytes
SHA-256: 5a44fa0121c6cf93f401849417be9f6e1f68d6f5da6ef9920f486a48bd712618
font_01_sfnt_off00015631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15631 10852 bytes
SHA-256: 5593502817e2946a24bfa53fd9bef60b7f95994be0766d328a4a1eea82865c26