Malicious PDF — malware analysis report

Static analysis result for SHA-256 316faad0891dfb73…

MALICIOUS

PDF

99.0 KB Created: 2021-09-01 09:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fc73e09d39eaa11908f37b6b8f0e999 SHA-1: fa0091af60b3a28019242eae3fe06b16d91d1f0d SHA-256: 316faad0891dfb73ff7ac8c8211389d9a513ecf1872016106d4804e167f251e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. Heuristics suggest it's a phishing lure and ClamAV detected it as Pdf.Phishing.Trojan. The file's structure and embedded links strongly suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=two+types+of+molecular+forces
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ehu7p2pp3l0itjc62pqo12o69d/67237055708.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a374558a5---mowojudenubatirefawuk.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df8cacb0e5d---bizegopidumagimukekogaxux.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2fehddukecs2mi6hqhivq1seef/relusun.pdf
    • http://studiorestagno.eu/userfiles/files/vugumudekapepodor.pdf
    • http://electronicaindex.nl/images/uploads/gikujev.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7139a04324---farujaw.pdf
    • http://alliance-ltd.com/userfiles/21896196153.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e4dd10c51---53693380745.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098791734725---kuforupis.pdf
    • https://condominiovillage.com/userfiles/file/73599701585.pdf
    • http://trivio.it/userfiles/files/gakazobasolipi.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/db9fc417beb5de3355c7604b10f4aef2/28433024331.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/85874466324.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/fujesugimotebod.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/38940470690.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f126239df2e---lavederex.pdf
    • https://a2designbg.com/userfiles/file/gowowuvikotuv.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/nozuvopuvepilafumud.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lf64qus1imghma3fjmo6avrtn3/29767840496.pdf
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/47885284353.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4858594064---fegizalum.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161298daf00026---ruwixiluno.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105664b60749---vurefakeravikazub.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca186b13c1---tovizobojilomapotanoba.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_off00011d4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16792 bytes
font_01_sfnt_off0001355f.bin
9a8cf66f69dc96f503a1ebfb50aed625dac12c7083c664ffe148f250c00a4fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 18172 bytes
font_02_sfnt_off000164a2.bin
d308ed178d85e1b4087fbb4ede7371de97a5afa3130b30fe705a5485e84de0ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164A2 10708 bytes

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