Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad13e474429d622…

MALICIOUS

PDF

82.9 KB Created: 2021-08-19 20:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a1557cd21ab29668c7e391bc41df0e2 SHA-1: 670a1d3ad0a75dfddd7c102d4364ca20fd9abc81 SHA-256: 4ad13e474429d62267afd718d97ee440ee57e1e628eb2ffc90898edc428143d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=tips+and+tricks+for+world+of+warships+legends PDF link annotation
    • http://tks-forever.com/upload/2021/07/25/file/78181963246.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/vanutifipaxanosiwabeniko.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607d3fbe34c49---zujolonusagamofilukugapu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/95272403855.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3172b3316---wigawuziripozaramegoba.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/55810450636.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/vefejaji.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/8293792355.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fizabuverajopikag.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/34351959264.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88359c745---71101462657.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b6c6cb698---bizewazorugijukawesapu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/29889846466.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820334a4208---37269288056.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bixogesosejujijabebu.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/dasigowosatosowiwelazojuj.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/3o571n53ntgsejlcilbsc3erac/pilowowezoxal.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d01c88e8---sanofalarirak.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/32046911184.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1ebaffe3---8336185926.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c96b0ab4a---wubuxiresutima.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0nvc478vduvcoo61v03grl2pu8/71075256252.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/76571729022.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/7996026053.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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 11040 bytes
SHA-256: 18d3e6d4ffe19431d32b5db2c665b0b4de43aff7b39d4dbb874dbbc43736f93d
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 17080 bytes
SHA-256: 9bed9679f164fd6bfda93a5d602099c47aac71be43029e5bbdc5aa171e0ac8ca
font_02_sfnt_off0001258e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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