Malicious PDF — malware analysis report

Static analysis result for SHA-256 da266d74a7c017db…

MALICIOUS

PDF

85.7 KB Created: 2021-08-07 19:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a903be12d53789b45eee9047da6b78cf SHA-1: e1ac700f35edf09b10197aee621dbc89a62be290 SHA-256: da266d74a7c017db2d49a16dc7405cd07602d1fe630dc50b9fcee26a91d93ee9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://go2germany.ru/files/file/safasukazamapoxekon.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610254a7b6472---gubarilafawedejemononuru.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vesolozirakolabo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ac167c50---4815905021.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/873203f542a67c00448986b8eb903a80/35516781600.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/53566423472.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/45527700661.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57ea4226d---64098390152.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee45f36572---vadazo.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/bivowufevalakolawuzojazox.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a8dd268b1d6d3b624366c9f011121123/30152168477.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/gofupebevamiwaboba.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/39768243013.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/39670124693.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/22336604481.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xonoruto.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/600694222.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/vepumuxirowun.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/6e2c6d4f0358f5b4e10b1fcf22d5bc1a/16597813826.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6235af192---tilitidatavexuxarigovaju.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zalalezetefivutogurupaweb.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vakul.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/ruxilid.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/7986398580.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81671867807.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8563d5911---15900524623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cuantos+centimetros+cubicos+tiene+un+litroPDF 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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 10664 bytes
SHA-256: 95ef7c143630eca9581f62e9cb7468b7be37b8c44d869f25c2487595a358ac6e
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 19300 bytes
SHA-256: 9a28cd187cbba2955276cc46c6c6d38bb5a090ae45de98d6ca0da3d485cf4e22
font_02_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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