Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9a91c1a7d05d75…

MALICIOUS

PDF

100.5 KB Created: 2021-06-11 19:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: be564408302a7a141556fba2ef11e4a2 SHA-1: 3a3daf7a1340cf56a3cb2c0d1c5baebe8cc4338c SHA-256: 8f9a91c1a7d05d75d0eb095433a1023fffde69dbc6af5bf7936430608294c0f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to distribute phishing content or manipulate search engine rankings. The presence of multiple external URIs and link farm heuristics strongly suggests this document is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=linea+de+damoiseau PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160870def8fef9---4365033691.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/89584577989.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b5dcfcc8eb80d6696e80b51f5480fdd1/zijagutilapofapisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2001ccb457---diwaxejegexufag.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/9d6b6e1c0071c89210c14cd5d21ae37c/64816737822.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/bekatuvirawaxonedixarusas.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d7moa1lajlmm931n9rqj3hhi61/89245364122.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/duturarumefof.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f0f861adeca36c324219c4c222c1fe03/xenafutoduvasugi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070405cbe398---59506157360.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/wuvel.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xegefuro.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607838563b5eb---34002948807.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb54869b5---84065053873.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bb79ae3deaf8e4edf1823f3a50152a35/42305729262.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb4ef422f1---87526643102.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaf1e9c04---77627376929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00013783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 4784 bytes
SHA-256: 793ed8db69da2d62e45bdd00498d6c7b428e29a60fc383b4f57698f6e6a5d662
font_01_sfnt_off000147ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 11996 bytes
SHA-256: 1ca3d77139d77f1830179a106530c41b228ea112cc9bde549b8c0dd2f39dffca
font_02_sfnt_off00016e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3C 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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