Malicious PDF — malware analysis report

Static analysis result for SHA-256 1333dc6842f6af7c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 07:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bc3bb74584e84467eeda9a823f940f0 SHA-1: 6025ee4c8408dabfd7e6d5c2e44074feab7334b0 SHA-256: 1333dc6842f6af7c61caf40c08c06380db740b043a4f76528038e4e3a2764c11
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. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns strongly suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://gestioniarmatoriali.it/xuxevegifavavelati.pdf In PDF document text
    • http://cariboohose.com/userfiles/file/zalilagogujexadodi.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/16545470917.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/67734946574.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/86362466096.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/91579297591.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418890eea0b---23641729550.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///23019976097.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/72f15b22ffcfef6f06449e79b5c8f00e/2715462927.pdfIn PDF document text
    • http://gespk.com/userfiles/file/bifubitakofesazis.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/xuxajinixigezivozilodeje.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/vojawalati.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/52147902041.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba19718703---65226553971.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/jajopaje.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/pesiperajoreruguda.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/mekizoburorumex.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/tatozavu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wajenato.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/64873155519.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/50392471871.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/javekebomobogazipi.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/18103372292.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109130458515562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=365+days+book+pdf+free+downloadPDF 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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 18052 bytes
SHA-256: 518155708df888742450be629613ccd6be68bddbbce1395dda9bbc5c71151f32
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 11108 bytes
SHA-256: b9dc2626fb481458d7a53ff7497ba0480a78aac7b9c6749c6160e2bd968d51a6