Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf2379131ea7e7e…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 07:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a02cddae5847576fce08aa882365d8b SHA-1: 6b4856082030ed9960d04ee7f18064926609315d SHA-256: 6cf2379131ea7e7e922d93fe6db7cedb5791d35a13f1e312e6c99d5663c0c27b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is part of a campaign to host and distribute malicious files via compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ahreco.com/uploads/news_file/fufexajagesozoleweg.pdf In PDF document text
    • http://haozuowenwang.com/imagefiles/file/32214562217.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kafuzi.pdfIn PDF document text
    • http://vkts.se/userfiles/file/30050418823.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/1106027916.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/50613e953a034ac582d44673e35f88e5/86352900864.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/26289643938.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ggljggpam7kfq62kaj5deaoufq/1154207672.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/rexebexedisunurilaremi.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/61482485775.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d9139c1891b2ca28055a765fca33c1c7/bupekexije.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8cd4644ec---40998835677.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/nineluvifurifipa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c39532da2ad---66790985695.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/zanibuvi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/4b324mvefva8hoek43j0o73efq/11434843512.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/87434920396.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/dawosifadavoroken.pdfIn PDF document text
    • http://dgjst.com/upfile/file/diluxapej.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160822bbaed7f9---44480152079.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1c674040c0b1a1cb10fbe9f46edc5135/84308744418.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082640102d6b---zipozakok.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da64c6eacc7---59117834355.pdfIn PDF document text
    • https://www.papelpop.com/201In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+do+filme+como+eu+era+antes+de+voc%C3%AA+dubladoPDF 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_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 11188 bytes
SHA-256: 7a3e1a5041468da86a3a82ef57eebfb49011027126cb01fd09e778ee270244ee
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 19640 bytes
SHA-256: 480d674f4dcdddff5a21d36dfa3fcec34e84abd86629993d0bdf1e557643a2f6

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