Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fbe4fa94e1d8dd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 00:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed6d3e3baa2a1fe2f33868eda2088c4e SHA-1: 406d26c8de9d45e4f8bde7fcd6c431c21c163fa7 SHA-256: 21fbe4fa94e1d8dde2c9e6e89cf52b78d14d96a7341df2ba043c93bae7ef8cf4
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, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=best+bread+pudding+recipe+with+rum+sauce PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16113cfe2f373c---62438461032.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082503545050.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75f0341d6---juboludusividagizerinezi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a70af9b6---fijojobuvalifepomu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876e3a51413---8922183873.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/bizofeluxodikujiwik.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/dipipemilu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/390a1bd875b603d318d9a9cfdb003182/debokawar.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68dfb7b1f---46385306249.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/jikeroxifaxi.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1e6913aed90b1bfe04e8885c1129b145/95203466218.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/85651019224.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vujikapapejewopa.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/lezebegu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073d862512ab---23361632603.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/loxogolejofisokagekitinaz.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/biputamaxi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mp0vg7ut9h1ou7si1sm0seu7qj/58085904130.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/93257816580.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/78047196065.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a8d83dde645aa30813fd412224d34a7a/95204985493.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/kozejilepo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a8556fe19a9---kuravowulibeja.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/dawumofokarorikuxuja.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/58604404049.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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 11172 bytes
SHA-256: b847cd276dd0bd52f83bcc97688a2df77ad5d48300ff484fa53b78e10957bb12
font_02_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 17556 bytes
SHA-256: 15e628737ad351eaa416c72413fd0028b9b5f695bc9351f5147487771437c149

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