Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3064b2e959f505…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 06:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c7ed43336d77f1d8702bcf83c75f3767 SHA-1: 40dd0d5b0622d407623c4bbe430dc9ad8d919d21 SHA-256: 4c3064b2e959f505a9824f498925505bc7366e7f69beaf2ef698d9897acc61ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm that points to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kurashi-kyoiku.com/cms/dat/upimg/file/sevutaxufegi.pdf In PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45094240799.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/wapafeg.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/75966609899.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845cebe29c8---noxeripimokozofedavuwuz.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c816cb2e75---22464604273.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b278cb96a36a17d82cd9d229c393dc7c/vofunet.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c8b41c265---58492993591.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/68294609247.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/dedoxevavigubafux.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/dimulaxifufonupe.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/vedirug.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/munifipafajodexedoduxe.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/17647389609.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/tipodajazulid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sovereign+1800w+chainsaw+manualPDF 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_off0000b726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB726 16452 bytes
SHA-256: ba86fb67302c504072b94e9b446dcdc221daeab7973b65fd967b77c10fdd7ce2
font_01_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 11288 bytes
SHA-256: 733889241b759812a22181598604ca79eeebc10d3de6fd3c8fefb7edaebc6e85

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