Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf968033a02ceb25…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 06:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0bdd9879d706c13864b186a562f54ff SHA-1: 77989a9121bc94cbd708103214b181a1e270b736 SHA-256: bf968033a02ceb25c65b5fb7a5d18da1ef2bc032b393bee5e00051412865f6b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://biomassasia.net/data_ed/userfiles/file/wumupetegabexofipum.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/q9jmplbk00vba4hbjuji7obqbn/73241371143.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a57d072b803---26373682745.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/8335034177.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c1f4fba46d2ee39f39d9f57802b85a8a/wubewokezuxipixuxo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ab889c01---82276552171.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e3884cc8d7505029094b7a35fb7c373b/vukajefetupolopetaxoj.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb80de39d---58201719700.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/abpu33u2ond6b0mu5ptac290vm/67572887985.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/mejopuloseb.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3f8474ac---79388610351.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/41808683972.pdfIn PDF document text
    • https://hirurgija.me//files/38768232730.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d4258d49b751de7a096bf7ef2f607f08/47702549226.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/7644041633.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/13bf1ec92d47c6ef1b9770aee79f66bf/86082382459.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/fubivupusak.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/1836711025.pdfIn PDF document text
    • http://abpaluso.com/upload/file/361067250.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///pabiferufagisomoso.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093f698185bf---welirusexe.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081759dd4e0b---nanigusuwapagabarasipawa.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f0faaeb4d---24226599729.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/56240372223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=house+of+miss+peregrinePDF link annotation
    • 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 10488 bytes
SHA-256: 17c4992360f1f1c4791c22eefff97506641c8300a1061c8550b0d6f7c649fe6c
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 17260 bytes
SHA-256: 0c08ab22ece13115bdae0de41f28af2a88deb8757b1a47a1cb7e829bd88f426b

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