Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff06aed988cf03a2…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 20:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6c0eac70fec9ee02b45719972673a61 SHA-1: 0aa880a89f1db77691013543d428ef57fc16fed9 SHA-256: ff06aed988cf03a2908a40581d504136b88a308868719145686782f7e0116626
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 disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=super+street+fighter+4+apk PDF link annotation
    • http://test-immo.com/file/wasozex.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/pagefajapajalofowoko.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/gozonutitegoda.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/xutazeruzedujuxusiwafare.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/16034638242.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e6cf279d---31647576876.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/16593198592.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/nokofela.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/97314583768.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/38334091358.pdfIn PDF document text
    • http://darec.sk/files/files/93314833130.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109200032109497.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/bidikedumukawopexel.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/34629795579.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c218b9f4a8---jejupolupavatexufejeser.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/42683368977.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8ad9de87---23580103502.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/16571892706.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/42710340885.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d27e678f3---19343205297.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c4c6f2676---70374590390.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/pegifax.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/nevisetodu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b1ff1f7b68c0969ef2458621616f7886/lutofunarazag.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/zedaporepupojozobogot.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_off0000b111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 10712 bytes
SHA-256: ead6879187dc40c8bd7ff1486085ed2b5c037183ceafd31153add0e9369ac59e
font_02_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 14792 bytes
SHA-256: e0e80117077fc6b96d29856d23ff077011180798692b646178915c455a961500

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