Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92406721aad1268…

MALICIOUS

PDF

87.6 KB Created: 2021-07-18 07:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20f871145a571cdfb627c56421606670 SHA-1: 468d4a58827de8976ebf9f872bd6d7428c63d6f5 SHA-256: f92406721aad1268555de959f14f0f094c6527d5e407b08f59cfccd9b3fa0625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and other disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for SEO poisoning or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2d54eaa654848903a81f4891345e2f88/xulinekupelajowovupumajig.pdf In PDF document text
    • http://copy2d.com/ftp/image/file/10941310049.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/surenetidetopil.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kukoxixunekunafomatiwa.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/68980295386.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/79743901249.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jilekalatupegeg.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qucul069195m44jrig97n90trq/lowamewutajunijofusuxo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f8ebc1ef---duvepitenabitozi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbf06c7bf---xitanemadunavafezekiri.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d53e295ab---85337165764.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/52a79de91193c817ca48bceb120cd843/kironax.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/74925896303.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d3886d1a2c28cff708fbce5f48bd8f32/11911000355.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0047f0e84---sonojukaguwe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc52a2fbf---lifarevesobu.pdfIn PDF document text
    • http://medi-sen.com/files/files/70137390956.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1f746ce874fdf685f0bcbfaf095805a5/25776995775.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/12550500221.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0a84a184---jobefawabiwopujike.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aac5bdcb1ff---92210217078.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ks2jsha9e9h468p0m2u8lr0b87/gerexixakifatikijutokubi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c388f9bdd7---kadulifomaku.pdfIn PDF document text
    • http://sun-tes.ru/files/file/xixijozasodufufunanem.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/96uhsiokv6lt4o32ig8nno36n7/kanakugedizeviwujesedev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=user+manual+for+galaxy+s4PDF link annotation
    • 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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 17220 bytes
SHA-256: 91c927ba93cfb048810f5cfbc7d17ca535acac2b95cbb2d00d58e8874eba133b
font_02_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 10768 bytes
SHA-256: 2aaadf6e938e8d224a80256f1d4ca0f52fafc2c1a663e5b03a5e97b00219f629