Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd07ca857595d1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d73729166744b646b0d7b825f79dece SHA-1: 8a25b31ac221e21a41ef74cc3aeba5b40f28f5a8 SHA-256: 3acd07ca857595d1007656ff14605d2659fc41a1036437bf835d5826214c86a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing embedded JavaScript. It also functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, likely to facilitate phishing or malware downloads. The embedded JavaScript is a key component for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=complete+key+student%27s+book+pdf PDF link annotation
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/04732e3657756175ed0d251466099790/19775424286.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/mupuxek.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612191fdc1be1---gixokewojetovo.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/14657909861.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/24204302503.pdfIn PDF document text
    • https://85097781.com/upload/files/gonejuvazano.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129edd043490---befapejanedalenusuvot.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/65693722648.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b9c9ee488a3a47612f889a98e02cbfd5/kovevizudirinojow.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786459e39df---7286894289.pdfIn PDF document text
    • http://aplus.to/userfiles/file/39416309522.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2de68cd6---wupibimesejijivuku.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/berunagur.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/49151115665.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/titawizegavalikatavarom.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608521c97a859---kojuzupivenema.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/09bb100fc3e4d080a78528c6ff1fb613/63612896970.pdfIn PDF document text
    • http://chpcentre.com/files/file/76511929619.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/50791999507.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/keranumogibaxekajajulazog.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e5488bc64c9a85912021db46956cf512/67501830474.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/tokegizuxonuviju.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae69a4a77---50827438804.pdfIn PDF document text
    • https://masihpt2.com/contents//files/35502669345.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/veruvok.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_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 18536 bytes
SHA-256: d082f515158cca5bd820248606e689986fabb43583f849f20cfcaadc50845f93
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10816 bytes
SHA-256: 2ca335427eef7f1efe5e0ad7e1d859b6706f1138af42228bb0186563c71236e5

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