Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5922fb66c27347a…

MALICIOUS

PDF

89.9 KB Created: 2021-08-11 08:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c748aa3a88f6d4e4f7980d0fc3eaa34 SHA-1: 2c70f199b7050471888b932c6473dc62e722c992 SHA-256: e5922fb66c27347add3676889c38325892e565868871259ebc85ed09db298ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://krisoc.ru/uplcv?utm_term=libro+el+shock+sentimental+descargar+gratis PDF link annotation
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb0504d4e---vozutaniluma.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/zaximu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a370034e2---38395820291.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/rotejofiwozuwekaval.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160887b9d92648---61687266978.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5c01dffd8e856e3b718fb17907b31160/94719845044.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f87be40e9---16220839373.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kiwisuli.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1bb7c1f8---nazigemudotu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/da38d687af3997b2500b760b7e0ce54a/mupalenajunewonopezurum.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nad4bpgo9346nc2f9k91emmako/31860352651.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/40905946473.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zulubonuvakure.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/patexixonubusurozi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995d193035---ponusapu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/noliriwujilozisupofagil.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nivudigufovulazitagu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e11guue84v494jacrrko2o9qa6/noroletumu.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/ninexik.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/99599709512.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084449966a2b---2828032151.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/96945790520.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/60179744116.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a37cc002d03---89016256526.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_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11004 bytes
SHA-256: 92dfe0cb45c03914a1e7a32b95e148c14af494dab7d2b17d4e6730a3e9731156
font_02_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 17304 bytes
SHA-256: 66f804a286ad1b68d7a2c60c288fa2d6c9fdfa5e73f7cdefd9e0ba572279b8b3

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