Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70d8e9afcd702cf…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 16:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a909fd5dcbd68d5e73c27f22ed842337 SHA-1: 64f5d534192909c57620580ed5885425cc2fba84 SHA-256: c70d8e9afcd702cfbe5295f3e539b6b35ced2eb9744507671fe641ce9d672737
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://udmvdpo.ru/images/files/fezorugewakiviruwowegabi.pdf
    • http://yilip.net/userData/board/file/77179029155.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/451b1cc22faee3d32523d2ff4a20ec0d/474259348.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/cetakque9a4rg5o09pfdrqvdgo/83327005853.pdf
    • https://zionapostolicministries.org/uploads/file/96331772611.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2c35a8e72d079dcf1bf74b36438e21f4/28333476472.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c47aae1493805fc11f77cd01ef573ee9/64225623412.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-12/20210512160758186207.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076f47977aa7---romaretapiledabufizo.pdf
    • https://an-professional.ru/img/files/file/kifesevasenologatuw.pdf
    • https://fo-prefectures.com/pages/files/sigidomutirekefawumerexib.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/nemm8p2idds40hh6mj9qhfefi1/9071572176.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fccde3021b---migelujodisemawogik.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae37bf7e9b6---70096723200.pdf
    • http://thingsantiquesla.com/userfiles/files/7122129328.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3elrip9rfvoa6ddekocic2ose3/jarerobimapukuki.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4d9d11d116c2e567d8fd6e108bf28e2f/38100194795.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/91f60fcf497569d08096e57b094e47bc/sinemuzuraj.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c9b1a039e396ac4afc589d850a3d95a1/48654638942.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b37c8faf1cf2c0a0975450c8a745bc2f/rikevobixumodusanelizew.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/98fb04183f16df17b3c5f9107db7a10f/5667493881.pdf
    • https://bdaudit.ro/userfiles/file/xobawolavipo.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4564b460edce01e0495712ce01f2b250/68410705924.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b0a7ee74---kavegovakomesajojoxa.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972e614ea1c---71127431182.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d8b68441---kixasosojuvusurutiromaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=low+cost+cow+shed+design+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_off0000ef41.bin
243654abda60e642ad2d19df86b0ece83af609b0f91d2a27697d9b0f2746a52f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10636 bytes
font_01_sfnt_off00010763.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 16792 bytes
font_02_sfnt_off00011f75.bin
66b64aa92adccff7d22afb16efc1ffc87c270ac5133bff61c5e478f2f06a176f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16932 bytes