Malicious PDF — malware analysis report

Static analysis result for SHA-256 416c8114b2b49627…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 15:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a1a61e2837bb423aaf0cea994d3d97c SHA-1: d95ecc57860eaea4913051151438947652cbc096 SHA-256: 416c8114b2b49627233eff4a719a40d4f8c7c03c0237330ec6a3b1965ebe1cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, many of which are configured to serve PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=meat+goat+prices+2020
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f89d3d9bd---jetoruxawowemenatuwore.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688ce9239d---kalesunevizowazopeji.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb034f6eb---61168005257.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c682659327d57e823ef907860f41cd17/81845544878.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804def17cec---25265750044.pdf
    • http://fsoa.cn/userfiles/file/87850924622.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/nmjrn23a1r589im6v0n5mld85d/rasamerokupelexezalokug.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d1c4ad9e28fa55af916ae2e3df071fd7/bazenadezedapesutigadupe.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d465b6202---wakuridabelopajebumevo.pdf
    • https://medtek.vn/storage/file/rawodisix.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zifunudisazalorit.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c191f34db0c---gerevezitil.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/39093053735.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/43167869263.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607347d162931---61556100636.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b184055505d---mofokunokujizezena.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef8d049f28---43927429430.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dd4f816c2b605baa811ff48bf609a0d/kipedabukapisaxavesa.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7924609b0f2de53dcd7121ef4b0d5a40/nabotatinidiji.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f921488ff2---gotawapajavetujopinubale.pdf
    • http://www.findvoters.com/userfiles/file/79795285113.pdf
    • http://voxel-avocats.fr/uploads/file/penoxemawewedo.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d13928ba6---46862188413.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13c.bin
6e3aeb4b81b322924356852c8d3cc5c4ea4dd26361cc6c0aabdb43ece66bba8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 17396 bytes
font_01_sfnt_off00010eea.bin
753adce8f83c3990ffafdd434101f9198a59e7144b69d3dab7348f452ee56f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 10632 bytes
font_02_sfnt_off00012779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 16792 bytes

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