Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffc5b8abe69809f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 02:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6fab130939891a471ae203469334146 SHA-1: ad74e62618fba9eea08ed77951b65acb4a8926fa SHA-256: 9ffc5b8abe69809f4392a7e3d6a00cc0094d5028859a27ee35973e84949a9e88
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to other locations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/168963b61ccb4aac50804d8dde41bff9/pasaropitopovikodef.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e79126d0---xomemi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6ae991d324c795d39e70124eb1e75f50/60300295738.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jozuxanuwowijevemil.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160890fb3ea6ef---32479594195.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/demuvulipaselojodu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b83f98412e6d6a96fe8ae7c1d4882bef/9142477367.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/74280587705.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/36096271023.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/zazesemovimo.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/vigibigijaxojolo.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/51194532867.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4ed449d33---mosebifutapezesuronuvu.pdfIn PDF document text
    • http://insei.eu/userfiles/files/23284800779.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d93aea618---25127382097.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5d785777---84357864605.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521092931645053.pdfIn PDF document text
    • https://airbays.com/userfiles/file/porumo.pdfIn PDF document text
    • https://irrisyst.eu/files/file/20449189756.pdfIn PDF document text
    • https://lesura.net/userfiles/file/tegefalilugivib.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/31907df3b6ddc32ff89311d97b8cb63d/61275639154.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/gonib.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/kugoguzasubo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d837d3066b00fee8ce703ffe1ccf5cf4/zolobobereliretadamuwef.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6252f26c0---rutijudukur.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/86576203010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cosmopolis+don+delillo+pdf+espa%C3%B1olPDF 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_off0000c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 17572 bytes
SHA-256: 5761c5a0ef54dde45a5d5c6db2f59016d0b022d0742552e6ac17dbb64f1f64e7
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10696 bytes
SHA-256: 9a72c06a4a51a84cc8c6d5ea09d6019dc428107f20bbd6c7b68649fd79cafc85
font_02_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1