Malicious PDF — malware analysis report

Static analysis result for SHA-256 75073e9a04d13338…

MALICIOUS

PDF

87.6 KB Created: 2021-08-17 23:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd772d33f4305245786e275f5a7d0656 SHA-1: 226494c23ee80db2fdb5bc7b5bbb7d9bdbd6953e SHA-256: 75073e9a04d133381d6fa79abfa53aca586f96e1cfc350e152374cc8dcfe6f40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm hosted on compromised CMS uploads to direct users to potentially malicious content. The presence of multiple URLs pointing to compromised WordPress uploads and disposable hosting suggests an attempt to distribute further malware or phishing content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive users into downloading harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4d234b2d---89559516197.pdf In PDF document text
    • http://i-daa-wl.de/userfiles/gajobelozuxenuninixe.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/9473397789.pdfIn PDF document text
    • http://fanghsin.com/uploads//files/202108120607275004.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840e8a06266---7459426413.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/zodibav.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607338e40249b---7820197103.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af140c05fc---87180274408.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/54b0ffac8f0cb508278b185234fbcf70/dolenuju.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210709133139.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/78073849994.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/vizomudesi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ee4c8c931f52f26f70940f9e211e332f/48688861013.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/25cc94029ce49f22fc20abeedf7ca7a3/99476033574.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f121b3132d---kosogumafewotonogabebula.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0aao6cveuhngeks5nl15dhhet0/legarobeveza.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gogebajifuguvaf.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/93794978801.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210603004305.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7fukf0hvfcq94gb4d09rjjv083/zobafanujedeluru.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a47746f1142---dikoxub.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/12042728180.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/80281029553.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd127f35d---51574109326.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9f06bb604---gedokexebukida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tooth+bonding+gap+costPDF 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_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10616 bytes
SHA-256: 1cadf60a4c7e85fa20009e7ca64c51d3a8faceb45b70602393ea27a4f77d5b5a
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 17356 bytes
SHA-256: 47ef130b760bc71205fefef673ce432c8a9dfaa4e604a36c32c1bcad288245e9
font_02_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1