Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bf5dafcb9105b4…

MALICIOUS

PDF

99.9 KB Created: 2021-08-18 21:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f97950108afde6692cba2e7456261a9f SHA-1: c2c3eb44f474b78a4c6da297899ff0ae321ef809 SHA-256: b9bf5dafcb9105b41c0889b1f91dc099efb745ad7f5c8b1139963eff6723720e
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised websites or disposable domains. This pattern is commonly used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bige.vn/uploads/userfiles/file/vukesarivasujagejusasa.pdf In PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59630962131.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/pusimelisufegix.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/33262834430.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/16195718078.pdfIn PDF document text
    • http://fotossc.pl/_files/file/22204911833.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/erotpiks4qetoco3tu2cmlon0l/69065090222.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ff50fc4e76538331dd518df9516ec605/54800827523.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/wesavo.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/vozotiwuviwafavozile.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/23921189109.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/xibije.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b1c325897be77c827518e29c3fd688bd/rebotufu.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/duregerizurawetoperize.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/66862441082.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/lekiber.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/br58eo3bml6hncsauteid5teu6/53898679893.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/b5rub0lho5gvh0sr7df6sop7ig/judezasogifolenapubomupo.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sorezo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/25c230eca77550e4983ee8e52a13daa5/vemiwupibemijekonedi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb91464e33---benulomewefej.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1322a4255---poverew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=regla+de+cramer+ejemplos+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://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_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 16196 bytes
SHA-256: d8ac9227fca862c90739a94af5a49f1b9ca4381a1365c4ed5d2c66d5bf44f42a
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 19856 bytes
SHA-256: 58b190835698b0aceebe14fb025a15c25a94faea6326db2aae72acbaacce8920
font_03_sfnt_off000165e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E6 10844 bytes
SHA-256: fc1b60726cb46b651ee423ead010e91ff0993639eb34a6102ac19e46759469ee

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