Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b31b9e853fb844…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 00:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf6d62c620237d11daeccaf930186f9a SHA-1: 75e6d592d13e9e986a404a834de4056131697001 SHA-256: b3b31b9e853fb84450504c7ce9d905eddbe618ed6b575959505c73dd23fbce7e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDFs hosted on compromised WordPress sites. This behavior is indicative of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16bc96ebab---dikeb.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607543043ae88---mazanuwela.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/93589215623.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130d08e3efc2---bupatulaginuxodifo.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802869cdc75---89190755947.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zoxokoxeboxizegurupegufe.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/67342587053.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/razinejadaga.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gedopozax.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99e40644b6---fesakezabomunoramaru.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16125fc55670b7---57130229745.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/526513278c4176d80f8f9630e06a4478/gebosefugitomupepev.pdfIn PDF document text
    • http://ridendo.cz/files/file/65361726306.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/fasigosavikamorimupu.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/pomidasasa.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/59018569934.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dibabhuaumaltt4bqdo6o993i3/kutajuxemexa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3565a19e0d---29706157527.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/zaketimitunufuzejuvogixu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead438b9b4---sitat.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/lusojigesesevafawugite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+residential+lease+agreement+texas+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_off0000c219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC219 17004 bytes
SHA-256: 0d80cc12bf70be8b285103ae37e03da9dc9becf58b30c43a2620b88a98ed4f12
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 10800 bytes
SHA-256: 9fe3f78e54be3daf79da25321d68ad3938fdb10d67744a55e9cdec9807591d10

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