Malicious PDF — malware analysis report

Static analysis result for SHA-256 abefc12c751ebdcc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 09:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa125f8875f31694ef2501de8a4c77a9 SHA-1: 67acae8f657d4eac492f665a63c76fb7de952b3a SHA-256: abefc12c751ebdcc04b014c99bd58c0eada6f9d1e0fdad6829d1cff78ea03f80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also includes numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=froggy+gets+dressed+worksheet PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0095029a---gosixetevetewili.pdfIn PDF document text
    • http://allycatering.com/userfiles/larowazulenaxuduzuzira.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4e5a0423---kodofamopolegosaziwar.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/67087282995.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97677690794.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/99d273ba18b26ad726e493254edc0d75/vifurazurizoto.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/572b4df6d2628aabeccf2f865de63261/megadupafobosaritefanati.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160756d66d6a03---deropexiparibarito.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a586e2dce---94188494362.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/38946473059.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210821_095551.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b430fefff6---99291381674.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/81d075e46b621dbe26cd3d7170d92de3/18074057086.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/zufizakomatosaso.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/pbphfpa2s64gdjq3jo590pjt15/38629106813.pdfIn PDF document text
    • https://x-software.cz/data/file/gofewakazevegakefoj.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/19596853570.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/87048699141.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/86879085715.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/13240211769.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/ramiw.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/didibefumazisux.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf26226f5---samukapuzekowi.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/dabizejapabunaj.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_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 17432 bytes
SHA-256: 38c1785b2420449ffff979fef37c08bfa020f457f2e758a458cb8eb06a5fe8c7
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 10392 bytes
SHA-256: be7d9083bfd7b919ab702a77a998f5fc08327381ee538c9db917a1f9ec164c30

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