Malicious PDF — malware analysis report

Static analysis result for SHA-256 df84cfb5178ce66b…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 01:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be2466cf0ea8345ea1d8ab9a7d6b135d SHA-1: 4d5557965315147fded4429904802337e7e5c8bb SHA-256: df84cfb5178ce66b40f0b478a755aaa9d4f74a89a1a0301addeb8b884e2f0d39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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=bleeding+out+of+your+ear
    • https://bursakaynak.com/userfiles/file/zubegofowuw.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53727395c---36153624577.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d669e152---sufot.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hhgqft0n5tjp7pmrfb7o69vist/44020181154.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31dde5f722---jovopewajenatuzominon.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a643f23eb68---81249242284.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/7l9fb16003bgg5r3uqd6j9v699/1730876661.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8r4aboupfnflg4vc6a6ar0hf13/fizemodu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a6a3c02a---41048925513.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3l5aeshnao5prt25onit87rb3c/fovupa.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/79d05e1459d6818c617f7404207c5c0e/xexoxikavif.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39a9a2747---65297324619.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f42d8759b---80394577418.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160742ce50a9e4---nogib.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/313bb539483e3633afd0c3e2b78edd25/30181498949.pdf
    • https://riolospettacoli.it/filesUploads/file/10181203753.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5365ba99f2532170022eea149b45abf2/jogeredibunepozesimojaki.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f42e5e23e---9545298688.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o9416tcisoi2ckggav6t9l46f0/sowipenubetigososobigixul.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2e91f77e16666aeeabea26df0dab1cc0/65798594994.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cff3bd9d8---1051499095.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098d61d7d94f---vilelavimenavepozu.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8fffbfa3d3a655b8ddd1377c18ac63c4/debokivedumovos.pdf
    • http://evola.it/userfiles/files/9249045227.pdf
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zafijupewera.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c50d92e0---37954974725.pdf
    • http://marinapogon.pl/upload/file/43089910903.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f209.bin
1cdd1019b0ed0faa036a3eaa51398e3e2939213f999b72a7361aadfd20369514
pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 10628 bytes
font_01_sfnt_off00010a4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 16792 bytes
font_02_sfnt_off0001225d.bin
98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 16092 bytes
font_03_sfnt_off0001379a.bin
b0e67b3e14b6dbf003e8ec3343ec1cb7f50425f7e5a8e37519f4c7784ceeb2f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 18736 bytes