Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dde34097daef578…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 11:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c57490546c4a6afa6c1e69c6710f5a5 SHA-1: 0be9677c59dc18d50e82c5cc9715fb8bad9f9161 SHA-256: 6dde34097daef578d78f5352204922dd769040927c74571fa30d99296317c716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=3+major+functions+of+the+stomach PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/76663019122.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/18586693701.pdfIn PDF document text
    • https://arendic.cl/files/senibotukijan.pdfIn PDF document text
    • http://mayjack.com/upload/files/21722298314.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021981420461072.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/wojagejevavivolopeli.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147b134bb063---16957631159.pdfIn PDF document text
    • https://everestart.com/images/stories/file/woridaxox.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/69286655779.pdfIn PDF document text
    • http://glassick.com/userfiles/file/loxonupumu.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/36455185279.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8f1j4v5ps8mbc04dmbif46emh7/bajemuj.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/5715915.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93918620896.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/78577080997.pdfIn PDF document text
    • https://bor-diing.com/upload/files/15205284291.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xonupor.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/kekeruvulazobemalin.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/94366251127.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/29875452217.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/47733109842.pdfIn PDF document text
    • http://oris-am.com/editor_up/11245149753.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/komuzubigus.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7fd79f9178cf90175c5ca8457f772c16/powusuxadugifojazirexu.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/taseraje.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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 17636 bytes
SHA-256: 2b3326380b49bede7f46eb29dce7f372e321b6c533f3341cc9b298f8da130852
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 10860 bytes
SHA-256: 4e3c9d786b189836d2b1df50a3a00d2593ed51daed4e325769f0341ae8eddd3d

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