Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c3afb000904294…

MALICIOUS

PDF

75.9 KB Created: 2021-08-10 18:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80f0e0aac866aa1802879da606bd824b SHA-1: 58af9870a27a2fea6fe56731344cdac0c0dcfe91 SHA-256: 87c3afb000904294f7edaeb1c56e5e20b84691e9a0b0b30b32844f7d6eaaeac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs that point to compromised WordPress sites, indicating it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=early+transcendentals+4th+edition PDF link annotation
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e51e5e51e---72829929487.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947accaee1e---jemiwulaga.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8166fca99f3e1fd82d8dda87bfe0edc7/32611865088.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/44119160852.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/310158528964.pdfIn PDF document text
    • http://imosa.asia/uploads//files/202108062328581258.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0hdosjc42n6vb15ip61chnr3dc/gudoxowofolag.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/981b13835449dcda6561f9c9d81cae5a/45931247064.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kafobojuwitofaxu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f5390ec599a800547681e6db808959a8/nopatofi.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e934653fbf---sixemipezefofarisuko.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160802b938be92---2664852515.pdfIn PDF document text
    • http://poliinc.com/upload/files/venanepote.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qj3ht4pb6urqrb383o8lqn51bf/vetitowuwonedan.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/78fc63810e19626600e341f87968cbb6/vulesusagamipazexuxixivux.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210630135224146.pdfIn PDF document text
    • http://apsons.eu/files/file/27766187339.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/53ffe6a256987d311d81ddb8457473e8/nekikodipipowakifigujufe.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/vukeluvibelibeduwiki.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/wixiwasoku.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/xozejapofajumabogukugago.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823722594aa---viligexumexivarijupotel.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/87306381981.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/pamidotirumat.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210523093426.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d099e3a945b---67273251298.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_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 16864 bytes
SHA-256: 6fbda7a81804bf4836f70da3b819fff9daea2005897561f8cc30c1f8d789dd28
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10640 bytes
SHA-256: 0e9d55a9b2faed705fc9df4093e797ece7a5205be323d7fa97b38af63d31b8e7
font_02_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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