Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c597449eea5bba5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 12:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78f1ed2697c8be3f771c614bfd179f6b SHA-1: 32829562a629979663e24b4169eee425ebdb52ab SHA-256: 5c597449eea5bba5f755714e8a1c224776d8d1db1ed26b8fa7d91db5db961c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites that host further PDF files, suggesting a multi-stage attack. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eea446464---13149247634.pdf In PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/temidixewenike.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/xodalonozuno.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/56856630787.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/62268837730.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/2721393688.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/33346580037.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/nofazasusajudurevoloxu.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/64462409813.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161359e71a000e---xunaf.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/jarabiwatujevafuw.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/60612751554.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/88707830504.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/99266817337.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/lipoxexokinovaru.pdfIn PDF document text
    • http://princeverma.in/uploads/files/jovepogolumazela.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14609545418.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/segurinerujufewojuwafefi.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/32622886197.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2299572260.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/me4n9lqpm5od1b8frqc26acud1/rurafuvesawabovaf.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/25332098779.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/87919612144.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090703511580554.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210903084513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=general+surgical+instruments+catalog+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 11100 bytes
SHA-256: fb8ec277c899abfb904a130144132c76c9ce9376e8bb0c7ce4c0b80a541faa16
font_02_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 17612 bytes
SHA-256: a4431095a0f886799246869b91934890ad4c2c612c8f15fb4931cdc8b30d2c78

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