Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9d5a4cecb0f64a…

MALICIOUS

PDF

87.6 KB Created: 2021-08-27 22:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7633b0fcbfdf42fa8138f70adf6072b1 SHA-1: cf4d60c5f6a11251387889a2d6bbd330fa800b63 SHA-256: 3d9d5a4cecb0f64aebd237f1fc581f98fe138d01a051f0f0f1965be5aab68299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=command+to+clear+cache+in+linux PDF link annotation
    • http://jjburgerut.com/uploads/files/foziwavawufipabemexuxaw.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hvscgdb6ri5fk3p3triug6e3k9/lawatexetimu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150dad7db61---689172292.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97a97dc4a5---52463853097.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9182b629cc---9919072445.pdfIn PDF document text
    • http://gekon.net/userfiles/file/73442259171.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160871a7e74ca1---38669061224.pdfIn PDF document text
    • https://lesura.net/userfiles/file/xegibarapubanewilox.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/sulowoxepenetujojetisiz.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/bixevosofivitufodusijobe.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/67783820775.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/51952580744.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607337f9b4e97---pekomamifekazaweb.pdfIn PDF document text
    • http://hk-keber.de/images/file/bozedubisof.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bcf6370866ae407e2ef3201044586c0/kuzerudos.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/44269744391.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/xefupuxilukipal.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/nadiwitejuwogowedivejis.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/17199111870.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/deminukamatuzekebadodaduw.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b12198534a2445e84e58fe4ce2a52827/widojix.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/38105767847.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb1de8c4a---99727893575.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 19184 bytes
SHA-256: 97d3815607e722264ba76d5d4fc7de846c549cb241eb476b887dc92cc172f117
font_01_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 10700 bytes
SHA-256: fc6aaeaab8bc67640b60242b3ef26229e1c39affc78b3e397adf06ec54c28878

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