Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15b81cc218b93bf…

MALICIOUS

PDF

106.4 KB Created: 2021-09-07 12:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fe085f528e04ca693fd9d1230569586 SHA-1: c619ee5194cca7e977bdc7b9e16517da6bd01773 SHA-256: c15b81cc218b93bfc96d4c619b04e0677140496476771bb053424361471ad124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://oniceh.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D9%82%D8%B5%D8%B5+%D8%A7%D9%86%D8%AC%D9%84%D9%8A%D8%B2%D9%8A%D8%A9+pdf PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mhmocsjl2ueru8n65scsdqfab1/bofidipipafabozus.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5660c4127117a9b9b32eabdbf111f4dd/70366672865.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5c2c305664d044c9e8513a0189ecdaf3/pinabokazesako.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/lotabatefotuzixeked.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p3qobnt2c25gs14npmvikd6sjj/wogodurufewiboxutazek.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210719_C859CB76D1CDD7CB.pdfIn PDF document text
    • http://arablift.net/userfiles/file/76505248116.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad35f8ffbd---632512104.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/87457342178.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/33595456807.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f466471416---tijijujudepi.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/12200867208.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ae91c317d58e470ff7831a4ab1e83975/toworinimiwopovom.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc26045a0---78312788157.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/9439ad2qeidovk7f7h9hk5smt1/60037840209.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840f914bdf6---luwuxazometuvati.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/nebowaripexewaxe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4d06686ec152abad0be6b1f2a0771746/28428162793.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/89666837967.pdfIn PDF document text
    • http://bienbao.org/uploads/files/93088116173.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/at0o1pginao5gpillq53ju83o1/99993053814.pdfIn PDF document text
    • https://ienter.bg/files/46626078262.pdfIn PDF document text
    • http://cosyromania.com/media/file/megivadalusibe.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jifokun.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/0ae0ef44abdb296fb2d24714f1c3e307/defesurozalivaxebakoraxa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000163ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x163EF 30016 bytes
SHA-256: 149bcd11f3f350179c7f8cee4d98c2eb2d53f802c81745ef0c9c77ba2b97a9e8
font_00_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 19016 bytes
SHA-256: 1bc818bdef5dd1ad2c40f1a1c047c9fb692ca1fbb40ea3b5c8ac6014f07fd468
font_01_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 24136 bytes
SHA-256: cf4469e6378f04e471238299dcdcdbc2e23306f425ecea224d17868e23b8e33b
font_02_sfnt_off00015011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15011 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724

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