Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bf3eaf695a0171…

MALICIOUS

PDF

63.7 KB Created: 2021-09-07 11:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b944fffe5d30a2529e2da9a8947ada27 SHA-1: 0bf94b847183876f8a9121f55a3b3d3b02ef44db SHA-256: 20bf3eaf695a0171987ccc57b995cffdf78d3fb7703ed5940f6567c117272808
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a tactic to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4699

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=computer+system+architecture+syllabus+pdf PDF link annotation
    • http://chingyi.tw/userfiles/files/fopakagagulovalazobum.pdfIn PDF document text
    • https://udruga-invalida.hr/files/pobizelemugijawujoviban.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/86833b1da7fb5cdddcc3844e33ce0edb/35474010734.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ec3271cdb---logiku.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/de4af07a70dbadcff07df7dcfad3db41/26732276159.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078811a26770---91925550436.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/18902903307.pdfIn PDF document text
    • http://sushi-belovo.ru/files/punupowodimanipav.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821b8cd363d---gexowug.pdfIn PDF document text
    • https://isosklo.cz/uploads/93815213881.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sr781h1eibi33t5qk83bh1m854/pedinifuwepelob.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e4d17fe996d912bd0af650d70f420438/52474235025.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607768bb8dfc9---77250470105.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/wawaxidudat.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/35h8ejd8e0qq69e1u64bv4t9d2/40727935264.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/87055073884.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c624b1a0f12a842940ffa83f41fcbe7a/webapadujurenidalefasidu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e695d6273df08186a160ffd2acb7071d/wixose.pdfIn PDF document text
    • http://kite-surf.sk/files/vimopinojumamugolenuve.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/56394508023.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/93639103893.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/nurijid.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a31e49fa---momofejujogeba.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/dolobujaxazedipivi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mk73to2itdsv27iudqotih0ju5/54444968494.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/56465614029.pdfIn PDF document text
    • http://qdjshg.com/files/file/wituwoginuwaxonudonugur.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0C 11168 bytes
SHA-256: d41bd4b48c52a1543ca4f11c49fe03431c7f7174e07d15539da770c186ab2a04
font_01_sfnt_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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