Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb4c09f7db3133f…

MALICIOUS

PDF

277.4 KB Created: 2021-09-08 10:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5165a31661696c0edfa01fa89d83cd76 SHA-1: 139afc21cf8d91a6452dec4f3b4dff9536c61fdc SHA-256: edb4c09f7db3133f76cdedd1c0f9beaec1e83ca17ab1f972ed470219882a199f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing or malware distribution scheme. The embedded URLs suggest an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=almanaque+das+curiosidades+matem%C3%A1ticas+pdf+download PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e0dba60067626fe81c3ceec99b5a9193/sidox.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/lenotipesobatobegeke.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/somupogivaj.pdfIn PDF document text
    • https://2acontractor.it/images/file/33482862772.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/10705039722.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/lemazogajesalizadepawuma.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/gubavenixeloburisikewe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090d43e9cb05---nekokezuxem.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d61a7c40---17870788869.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d187fe7f3319fc23a4db0fcafd94d01/16111681211.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47d04755a---lewakudot.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/zeremafakurexazewuxix.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/36078317997.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/51595157454.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/robotekenazamalegixe.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/88297186302.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q0o4l35hj9i86hlg782ot8cpq5/lavejamonezokoma.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/kosolijokadosedomubopiwes.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/784041f5f633c522bd519dcb58cdfce1/rezufuzisepokisek.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-26/20210526200222426320.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2115f1347---90995959119.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/46320815295.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f64192b41---36061884607.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85dc872ed---93925788130.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ced5e6caa---kiretipijesibi.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/kinegamabivadejate.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_off0003cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3CFAC 27112 bytes
SHA-256: 40aec018dc1e6f28b7cc17baae0e3e56b2fb7d8b795e0fc7d690d7268442d46d
font_01_sfnt_off000411e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x411E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00042a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42A00 11272 bytes
SHA-256: e7b2706db8e12b0580d74f4c159df56bc86e58bda8f7a7cee11e5093ed82a31b

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