Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f1300440041641…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 08:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d666c30b8d00360c7676f90519303a6a SHA-1: 50ff5d38e661e49f4bac4311216aed2b22606292 SHA-256: a9f1300440041641e53a26e2bb18ebc4d6412c754d141aa31b513d5d40afc704
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or domains that appear to be disposable. The ML classifier strongly indicated maliciousness, and the heuristics suggest this PDF is designed as a link farm. No scripts were extracted, but the primary function appears to be redirecting users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=html5+video+player+android PDF link annotation
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/98093607541.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/nofarilufovamosidopomo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0d841dffa459b5a3b1379b504b08e0cb/kobusexosaxugosokapeno.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/53006025656.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/bojopunekufarunirexutuvog.pdfIn PDF document text
    • http://llux.vn/uploads/files/kadoladosazisasifob.pdfIn PDF document text
    • https://atiksigorta.com/files/89706436691.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/58172032554.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144da0ab69ad---78536668220.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630508584.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/49911243124.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/23554795304.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/roxibime.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/20053207101.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/nebikarogudexi.pdfIn PDF document text
    • http://lactopad.com/uploads/files/64611973813.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/1107926571.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/tivikonevaburejosexu.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/rufuvobumatere.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4d62dabef4e376bfe21a3c4c34731371/vukigopovujerubiwim.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zamuzatolet.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/91b84fd7ae65310d1ade4bbf54280be5/48524383459.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/74527677332.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ok3erfmn980boi99rkkdesl0cj/15095121574.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459044ee496---vaderobozirugojumukuwel.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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 10688 bytes
SHA-256: 0f8d10210f6e5a664c6f26ac53e9a32d851f669927ecb69a13b7d1cdda17d47b
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 18092 bytes
SHA-256: 61fb323794f316d6e44b1ca0639ab81f103a1dda43b62633b8d669df6b38b23d
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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