Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c7319e5d960a34…

MALICIOUS

PDF

77.7 KB Created: 2021-08-08 23:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e1ac35d8b8a2c456c5925a1c74d4c26 SHA-1: 3a5a936b3c24e8e6f6a924dfeee7b9ad719d14fa SHA-256: 64c7319e5d960a34c73eb2e60066a68dec202a0db47a2c084006420fc097e8a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=genie+garage+door+opener+remote+setup PDF link annotation
    • http://anhbanglaw.com/userfiles/file/tibonuzeg.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bb6cbba82e9be4a8dd816185b6f7ab74/5756405300.pdfIn PDF document text
    • https://zhansq.cn/upload/file/31781596915.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/dab5c41fb98a708fb76c78187e1bee46/xewisag.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/79638726430.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/dinon.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0472224f---54726405600.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kepigoxuwo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///ruvowi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/22495502740.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/93665651230.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/83894722818.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad76a350239---92996617468.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lezonemel.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869018d629a---tikubivafavujuvowikutefu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ec87da8c7f39afe58b507c75b2cf2049/duwefol.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/72823438887.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64504409601.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a355c6d1dc4---jivewimazuwefupawa.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/kirenefitafetejuzuzam.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1fdc959386bcc2bad08df64acf6b240c/17171226317.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/61615878188.pdfIn 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://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_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 10828 bytes
SHA-256: f2af6ab3c453659d7996a18a2e34c19e4d87f2abe130fc428feaebe3dbee1433
font_01_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 16056 bytes
SHA-256: 02b1c81ee311ad4f8d1ee35887694cd7ed6ac4638b991269a7dc3ee4eb03aff1

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