Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5b72f9ee8e84ad…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 09:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bdb94a363e4abe96c3f6312054c17bec SHA-1: cac16e21a46bb2e8dc5b19c4bf91b940a75a14ed SHA-256: 1e5b72f9ee8e84ad2b42aa28c1fbc115d149fa626fa40a8c4eaa7ab6810f0eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The file functions as a link farm, directing users to various potentially compromised websites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fizjolech.pl/userfiles/file/20474716669.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a35efaf073d---runodaguli.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/moxinuxoselapesisa.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/15136404623.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0286474b26---25900349168.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/32463566406.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/efb8a826718f30d5dfb9eab00d9e6e54/povefeludokipiji.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/maleporulalufure.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/15852213896.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610487495fa62---lapudatevevudese.pdfIn PDF document text
    • https://ijpdua.com/contents//files/mimijikogogavi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a8657bcd91a67767da45e293dada52ca/44749974810.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbf394afd---puzegagofuso.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/letazumazujowomapuril.pdfIn PDF document text
    • http://getvisa.ru/images/File/53510766205.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hb4c9137g65v291lvo9k3dpeo3/dofelogodujisijituduzopod.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/35519604154.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097291d3a302---67949788839.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/24509011058.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/56690030614.pdfIn PDF document text
    • http://fedoro.ru/upload/file/59772245751.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/63184736004.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/pujogegizexufudutupowap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=br%C3%BCche+dezimalzahlen+%C3%BCbungen+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_off0000c419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC419 17820 bytes
SHA-256: 0a63897577d759ee1203376c1053c41d7bb93bf3da22be4b482adeb92dfdad67
font_01_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 11228 bytes
SHA-256: 93dad8578c023ad2d2c4e9b02dbdfbbd17318b2538d3275b372d546ded70a91a
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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