Malicious PDF — malware analysis report

Static analysis result for SHA-256 3116f5bffa0be117…

MALICIOUS

PDF

80.4 KB Created: 2021-06-15 16:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b60f378c813ab4116d0cc84b28be9f SHA-1: 9038b03da8c6b0f7d0bd45ee40e6c76aeb78ce2b SHA-256: 3116f5bffa0be117b77c04531ef6679562a5de7e38335b59966c7e46d1c5ed1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm designed to redirect users to potentially malicious content, masquerading as game download links. The URLs point to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crysiq.ru/uplcv?utm_term=nba+2k18+ps3+download
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c423593a04---18135754027.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/iv2rrtrjmm8mvkei8ghpe922j8/movopuradirevapefisokab.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed166945d---7787197885.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b310a57ec93---jozebexeden.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/d4fm0v9tg7fseifluj6jtsj2tp/74620896496.pdf
    • http://modnyi-buket.ru/uploads/files/99106967739.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/vepoxunivisuperexezuba.pdf
    • https://contabil-fiscal.ro/mm/file/xozesenuzibogalatedew.pdf
    • https://fultoys.com/userfiles/zogukofesixixunuzidama.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1eb51ea4---20848587790.pdf
    • https://clumba-indoor.ru/files/files/famurelono.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdc834437f5e0446df2ae69f6bfefec2/garenuta.pdf
    • https://banghenails.com/upload/file/40559963056.pdf
    • http://staractivecollection.com/resimler/site/files/32072534165.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e9df295ab9d0f4b3f57fd06f82fcead0/77822153500.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/q2l8e342durrmob6pf0drje4gr/kudimon.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a608a51169e---babiwirowematu.pdf
    • https://anmoul.com/userfiles/file/zuvawaxulewagusizexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb92.bin
40a504b86e7b85cecb64869f74b3ca7cd5ba152d125a796b00370c57c020e229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 5664 bytes
font_01_sfnt_off00010f07.bin
8c5efbca86f4e9a40ea752eeb196c6b03e04b5d588a0e690671a907eceb60aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 10928 bytes

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