Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef8cbdbed244e24…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 039e9c28fa5e5efc1f8009f9668befac SHA-1: c63936afd18c85f28b7ff73500608ea89b10ad25 SHA-256: 4ef8cbdbed244e2406ed5a9d4ca4635678dbd5d1461f09bce984c75c8aae960b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The heuristics identified the document as a link farm, with many URLs hosted on compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://asvpp.fr/pdf/10978769269.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbffae1a35---dudexepezizolirat.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/e1bka9ikanierq6buhf58skr4i/12056821257.pdf
    • http://alexlunacoach.com/img/editor/file/supiwitanivewixax.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2ff7869900b1943ab630a4414743e63c/72467956879.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4b98b6e62fec4eef2891bb869af4c001/85075973489.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fb158127d2cb6f3baa054839504b34d8/womebajewagimev.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8214f943c201386e1f4506eeb609c8df/64726862551.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46318cde4d---vesurobidafuru.pdf
    • https://loyallcanada.ca/editor_files/file/vizakajuzazuvujesodedig.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc95d256fe---89233977374.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48e3c4fe1---29239872845.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be45dc1f602---68509578784.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5678538b76---noziwunoxutijinodike.pdf
    • http://phuocthuan.vn/images/pic/file/gevapadiwufebon.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b0bbd6af---14498838679.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7fdb3eb84a885dcb531a791974090c9b/woxowosov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=anger+and+heart+attacks
    • 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_off0000f668.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16792 bytes
font_01_sfnt_off00010e7f.bin
61f157802a91e10b16358a4cfb318c97068f7b8714c22e1204d9b72b7e8a4a49
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 10464 bytes
font_02_sfnt_off00012609.bin
68644b554c3df49bb55444dc3c41f131433ab4cd72f061eb51555b1454bc5e22
pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 16560 bytes