Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6929fc4ce5be62…

MALICIOUS

PDF

97.4 KB Created: 2021-08-14 08:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a9c371a9547000b7a1ecbb351531f25 SHA-1: 4d46d016545f323a8b47293b04c8585a26d5bea2 SHA-256: cb6929fc4ce5be6230528540fcfda499683c5ddd970127aa34479746edcc3433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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=chandni+chowk+lehengas PDF link annotation
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/76491954881.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe328cc4a4---74538240256.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210812225446_2034401829.pdfIn PDF document text
    • http://velisend.ru/photos/file/sabatipalirotok.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/12287117090.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/14618139855.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f8345fe0be2---fajonoso.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f4aa7f005719f9b69b5ba98f61791bd2/20152690507.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07fdf23412---33296783335.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xojirorobu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/uroni0hi7l0d46iubgpri36suq/sawawivudulitafifujelifep.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/86877032270.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f470507f2e0---71848026569.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f82cbb37349e129ae706104606e70f6f/62993946688.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a1756906dde684b7960ad75e68d6684e/sodizewelajazaw.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/43098016276.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113a3411ada3.pdfIn PDF document text
    • http://gistys.com/userfiles/file/zexowu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bf83ff0cd9f052bb3112d5a21fd33873/38807885240.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/92979038229.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 17276 bytes
SHA-256: 47fbf613a111c233e2be648b1fdfc05d6f46c6e1994c8054dbb87c1fdeaf1755
font_03_sfnt_off00016051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16051 10660 bytes
SHA-256: 3368e829745df111dded5a4a61c1e08b8d3774870d009cdad181a73e77dd7608

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