Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dd59a91b859204…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 17:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 588ad4ced0c45bb53d41b8b3fcc0e160 SHA-1: e1398d129abe0ea6477d1fea90f28fb14e703588 SHA-256: 23dd59a91b8592046805ed1ac5198c40c69fdd1ad8793a660e4cd7afb2a7c0fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content, likely as part of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=the+art+of+noticing+rob+walker+pdf PDF link annotation
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d8d356bef6f7e35551eb08fc5bd10612/33619534362.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8fa7f9331940a699a8a406f243bcfcb6/1942875154.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5b83e371b00b748b7fcb829a5f2cd28e/pipiwedesadusagisodarejep.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4728083327---20172578674.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/kepalozamiseb.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124e4c88ae9e---gunerojidimijugejomo.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/11549324675.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/74c8ec12a6efb114ae2442178401ec14/vetamefo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160718d6d6c177---52328510822.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c4d5998d48d302c8353109f2291f56fb/2401898302.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9ts62kmicmqaat1dv2dtbgk861/voruga.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/77311022453.pdfIn PDF document text
    • http://boldogelet.hu/media/kujaveboxojusugapiv.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/62016533064.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/12525298655.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc0a73fed6---rukaduvakebozazanilelaw.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8442bb675d---15944590389.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/tagobutefapado.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/funejovakodujutovake.pdfIn PDF document text
    • http://arslanemlak.come/file/zakunekawejetazekudus.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jufesojusabewawemabiweruw.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/xotenoxuresopizu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/67362827702.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610db8d9b0390---lagexo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ea420b68ec7aeca9ed9a2c5a9d78dd63/40266569335.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/94921578100.pdfIn 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://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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 11012 bytes
SHA-256: 25770ae6205db422355b561be59d6c6c1138cd7146adba794491da16f3a744b0
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 17768 bytes
SHA-256: 71831cefe09e9cbe88bbe429daad027e90245962a70932751b5f92ff72c6268c

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