Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbaf7311b534ea4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 13:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e53aa40aa798e7e80e5537918f45a86 SHA-1: ae72115e08fa573a28c5c0104b8a5fad8cc53a39 SHA-256: 1fbaf7311b534ea411622df5b0b6c4964e228a1d9493b0878c8a781617f4cfea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to potentially malicious or phishing content. The presence of multiple external URIs and link farm heuristics indicates an attempt to direct users to external resources, likely for phishing or malware distribution.

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 https://nomylo.ru/uplcv?utm_term=fra+iphone+til+android PDF link annotation
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cks9i4m3nhc20nvurachec744p/sepamamijewadazinada.pdfIn PDF document text
    • http://yilip.net/userData/board/file/bipalixas.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/xaturak.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gesamix.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/muvewedurepepusogesej.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f308121e8c---sulumadizurosononago.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8252ca5f53e7c47f35f2acd5beef8d2d/padediwebosik.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd837471ad2e01f2dba8610ced0aafcf/judixawuzoneki.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/xolabexonufowiraj.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f584e9dfb---45712702355.pdfIn PDF document text
    • https://asiapharma.la/files/files/2053271252.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/xevudewotedivud.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/78ktsrmp6q2fl7f9r3a3vpm1n0/ziwuwasusosawadaza.pdfIn PDF document text
    • http://ellev.fr/upload/files/39645597929.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365581ac24a---belamalefiguzuduvavipev.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/jusuraj.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/kugizavuwevodo.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/59867933640.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/tebud.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/nevijiginasatidotoz.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/88698590486.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/jogufodafebi.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/xibilurewopopeja.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/78059314780.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10300 bytes
SHA-256: 3deb4a2150ecf3978ad1f5073753d7657840fdb9a4d2b15d1d25457571ba1cec
font_02_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 18468 bytes
SHA-256: 798d6ae208dd206b502044a9db2db3a374a8a51c877d1116dcc4b5a728896b43

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