Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf3c32ad75114ad…

MALICIOUS

PDF

75.7 KB Created: 2021-06-18 18:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b39d388530ee1396c169b51034336722 SHA-1: b48c5b842a2f5943b92738d94879ed34a367f7d2 SHA-256: acf3c32ad75114ad3ec37698a2e38a6f27f4ea52c8a1182c53da086b67310cfc
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites using form upload plugins, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to leverage external links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd93041c84a---zipadebajag.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8e116576---17743238262.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/22694630664.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/rasigog.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ss6g9bh1c5ullpidk6n1t85al6/lasox.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/prjao1ltq6t4m6rikk6j8dekej/zixanimipe.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/96111285160.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb13663c5b4---41767449896.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/55258047408.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/bd4c33217fe318e3c0858ee44822dfc3/fewofepirutedipizilox.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/tusawutijosijonexusokodaw.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/noxixopebexun.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/widubugidukum.pdfIn PDF document text
    • http://renovator.cz/files/file/19006498430.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0d0985c6---sifufitobuke.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/21276579675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=vaincre+ses+peurs+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 5080 bytes
SHA-256: 3f4d544609eae77fb725519bc595140a5bfd470da81fcdfb86e0dd20bb5f249c
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 12772 bytes
SHA-256: 6c3b2639d676105cc1d86dab94bcab81d7998f25557e7601dfcb89717e2c8eaf

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