Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dcc2fb0acfa3f0…

MALICIOUS

PDF

296.7 KB Created: 2021-06-19 03:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 73ece4300984079e1cc3d7a587038fe9 SHA-1: 4030bb8615d019034a17b6c378d12757cc65e812 SHA-256: 55dcc2fb0acfa3f0977b0e5b70b8fd273c50a62ce74e47ec5522625728e266f8
126 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 0.9952

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.
  • 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://laborke.ru/uplcv?utm_term=michael+jackson+mp4+songs+download+free PDF link annotation
    • https://tort-art.ru/userfiles/file/nefofur.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/bilinemebarizatizovel.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/zotazixedefotabil.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/70462842835.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db545cf0---zaxolugoli.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d4576be191633d7fbb81fdd36cbb5b46/fatakef.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/bipapimibomi.pdfIn PDF document text
    • http://capital96.com/userfiles/file/nekevoxev.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/neviwitigasigigiviz.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6e90545ceba1b93e567f6ef7c823980e/82895861321.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b070dad0610---84216828120.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/j4aegba0fg6tf4hp30t8s10up1/81850583871.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/gepewunolomajegof.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dfce7cbb8977d42083f66a4a954fe5b8/60689578184.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/073e0f50298e2c0510cc9dde35df5342/limutovolivimawerinewe.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/53462817648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41C91 12240 bytes
SHA-256: 8fd05bd0a4900d30ba8fa406d048913cfba65306e4ce151f8ee5dee76cbec469
font_01_sfnt_off00044434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44434 5892 bytes
SHA-256: f126f055ebed6e977afcd282dc00343d78b9c442dad1e93453af0d833f565293
font_02_sfnt_off00045844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45844 21000 bytes
SHA-256: 7c2152ed51413b7edd9cbede9b463ab7592b9aef4cff8372be05153dce0b1a71

Open this report in the interactive analyzer, or submit your own file for analysis.