Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2055a44cbbdda35…

MALICIOUS

PDF

98.2 KB Created: 2021-07-07 03:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5cb103e3af12479f657903502b7f3bd SHA-1: 1c4baa2639a0e2cfb163ca1c8f1ae5bed1ab3e99 SHA-256: d2055a44cbbdda3590d4eaa4292e2ebd628f3e135a0fa56c5ebb57d55e7e5d18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+to+make+a+commander+deck+mtg
    • https://newchat.xyz/js/ckfinder/userfiles/files/11141890054.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd95f090be---telurobomajexubumovalig.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2db226cea---felukanuxakugagirowema.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/tasemede.pdf
    • http://tpdw.pl/userfiles/file/wufumotejuwifewoboxox.pdf
    • https://lawyerupsmart.com/tempimg/file/25044028688.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b24187ce8a2---wusujutilizarejuzipi.pdf
    • http://tourister.kr/userfiles/file/kogivat.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/ab91e838976c271cdfa394402c85be10/gudekimurur.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2qi2pt75fdo30k2qter6pnugnu/31487325483.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0c55fb6fa5abe35ec1f491d5f1cd424a/84334446939.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/27538004525.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b282e830e---tixomebuxik.pdf
    • https://aterhesseg.com/up_image/file/90400524374.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adc76743ef5---mizavodiwiv.pdf
    • http://youngshiny.com/userfiles/file/1622680245.pdf
    • http://world-green-hope.com/uploads/files/87179816948.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607db42d2a362---48171325776.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/14365406817.pdf
    • https://recapress.com/ckfinder/userfiles/files/zunamanifanaxofofav.pdf
    • https://amatnieks.lv/pictures/image/49180256015.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/08c8ca1607380f939a82702cb4a4614a/8645480837.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/068b3a1666f00227b63b9dbb80cfe708/neluvajuguzovoru.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_off00011dba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 16792 bytes
font_01_sfnt_off000135d1.bin
f86478f3b3a5078b3055b521d8de8bb9ce820d54d2fa24827555a11796893ae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D1 10576 bytes
font_02_sfnt_off00014dbd.bin
df9b3a6febf504985d0c2896ecc276f4cbeea52dd8fda976a748e6c631d01377
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBD 17564 bytes