Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2771eba62e99d2…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 02:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5234bc125b19f968e7e1de4180ba419 SHA-1: 7eb4bcffac3b930ce7002a54e6479539e1e0bf4d SHA-256: 8f2771eba62e99d289f1a3fad4b7089097022706969fe7e4330bfafcca71393d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised content management systems. The ML classifier strongly indicates maliciousness, and the presence of multiple external links suggests an attempt to redirect the user to potentially harmful sites. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=what+does+good+vibe+mean
    • https://krossi.ru/images/content/files/99522600386.pdf
    • http://creationart.hu/files/file/75157619781.pdf
    • https://kvzriu.org/images/file/sazugigakatunapudagofox.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/vavusaxu.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/70860782937.pdf
    • http://www.addvanceo.info/userfiles/files/jesufuzitapixofebevejas.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/22123748554.pdf
    • https://igraonica.me/userfiles/file/78701445138.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/kulinip.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615076220006c---votazemuronob.pdf
    • http://freeware-software-download.de/uploads/editor/file/12243375200.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/sodokukixiv.pdf
    • http://highendschmiede.de/highendfiles/file/38289768294.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/vexaxovugasiwigibosez.pdf
    • http://electronicaindex.nl/images/uploads/92677724766.pdf
    • http://intelekt.biz/uploads/pages/files/33906202873.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8p56hrjquqrmi2jag8cnmkc9j/bevisomukazumodit.pdf
    • http://spalovnachemolak.sk/userfiles/file/55561851811.pdf
    • http://nb-magnet.com/upload/files/zozonoduvizapuwil.pdf
    • https://needletherapy.eu/upload/file/79140408363.pdf
    • https://ap-qatar.com/userfiles/files/76861251147.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156933a708b0---bukafo.pdf
    • https://anakaygame.net/calisma2/files/uploads/feramemu.pdf
    • https://netkat.in/ckfinder/userfiles/files/tovumitumefasereme.pdf
    • http://luchetti.it/userfiles/files/dumadovo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 16792 bytes
font_01_sfnt_off0000c878.bin
2ed86f979c6f2d82f46e79e415f9139e5ad635865e974fcccdb86880d1e00d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 10748 bytes
font_02_sfnt_off0000e0d6.bin
97d4d0c1d27c348bf1949f77378d3524886907ed9fb080dbd7de3629b7a3f5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 15176 bytes

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