Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f85c04144e58a8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 20:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d5c37d8956d6b92fe0169aa64e10baa SHA-1: 92a23d15ea62c1c4ba1aa69d91a032d8c1b5945b SHA-256: 54f85c04144e58a8a42510f712c24c022053ede253649cc55f5d1628f0e9cea4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.pdf In PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/34073568405.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/zubibumirabevifadob.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uvau6vvirkrhclukgcsedlta32/61647244023.pdfIn PDF document text
    • http://fxlcd.com/upload/file/9047120096.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/xowotulefepixidamekosed.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1aec6837216e1c4de6a4d443e91e6edc/vakajeribasezag.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea69e0b83---vigovabe.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/73418816430.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/29001988846.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/74541107122.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/76394448785.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/34257803705.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/48330288564.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/xogafetelamagigubefud.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/gaxuper.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3f3424122f185c8f4a27c8d6578f5dd6/58198537689.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/wusebafibi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/36246265574.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/kubejoxojol.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/81664249778.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/931f24534adb202d9952b663ed686c25/96462309887.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c06e9dd8b---6262089526.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tamikujewowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+astronomy+apps+for+android+phonesPDF 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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10808 bytes
SHA-256: 89581ff0ad9f354cf4ccf5552dbcfb62e7fa23e6ecb14872090da8450421ac30
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 17844 bytes
SHA-256: aa9472f85cab184e5502ff77127da53ecd6c0be946a21e262b6108bd6dff9952

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