Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f901b28ad5c2cd8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 03:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2fd9f07171bc394f3756b320a4c1ac58 SHA-1: 8fe019677779ce4c2d7d538fc29a36b56368a272 SHA-256: 9f901b28ad5c2cd8278324585d063a4d1b3bb9c459358398e49ec6d28e0bd2a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent. While no scripts were explicitly extracted, the structure suggests it's designed to facilitate phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mnogonomerov.ru/uploads/file/xovenexamotedowilivemajiv.pdf In PDF document text
    • http://kangs78.com/clients/66216/File/lenakafigugatamaso.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/59685085028.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2cr0l6pr1dfrp0hgugqaa96fsp/66720815576.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/soredukebupo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4684a79a3d483a76ffdc2d659d242709/wivoxikenakoxozogo.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/fulepelanubixidor.pdfIn PDF document text
    • https://ovalpolycoats.com/media/69051768391.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/bofunuwowev.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f34e3ac8ca4b2ddda7d2ab72a6cf1499/42264978174.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/figafekurusevekavugogu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087804a06fa2---jovegufivakofevasi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/60c8e1739d594f7c72e7a80e69d1d054/40098999385.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083541fb7b67---dobub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7708d4c714---24915013376.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wodazimiwarepiwekobov.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e255ae4762---4073601979.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f15a2345---nejomil.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078518435625---kogetokulavowifajajesum.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/vusijutafilepajofojij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=conversor+de+pdf+em+jpg+freePDF 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_off0000ba22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA22 18136 bytes
SHA-256: be944acd6edf050613194d7a98e378a4c63b86a420baa65e30292d9a50cd556a
font_01_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 10668 bytes
SHA-256: ab58af11cad9bc3e9c8be4efcefde0ee653cb822d3be766ef0a9099569e583f3
font_02_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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