Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6aa2b7fbd3127d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 04:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19e6d911bf4923928d54401a734cdb1f SHA-1: 9a13f68bc06d430a417b8b8a80d906849d262577 SHA-256: 6a6aa2b7fbd3127df8efdebf1dae203c4b0311930aea6dee5d46b904c6c6ca7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised CMS upload storage, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://dadesigning.com/daduserfiles/files/91662885493.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/b1bj2igcrq8vqpgdmt8qcj9g6q/gulanafunudurigonobu.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/94480311856.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/20597133529.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/zubanafefumuvekuves.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/suzagotipefudubupiduzidu.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kulizaliwidajesezegiwa.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/zixejaseroji.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614431ac42878---zizux.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/rakorizujaluvelisaruxe.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/32968883669.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa91f4a774---jemuleka.pdfIn PDF document text
    • https://bolahijau.com/contents/files/zebiwixokikumav.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/jepadanajizi.pdfIn PDF document text
    • https://iwistw.com/upload/files/borapidinolunejepebi.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/fuvasiwe.pdfIn PDF document text
    • http://pk.mo/userfiles/file/46038396190.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6bc91af49cb0d01063a31676757d2994/24042456447.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/70579080926.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/wutedawero.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/16268762276.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161511a06bdecf---50103278816.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210919175715708.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/25773357926.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rejofolevejajob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kung+fu+panda+3+android+game+downloadPDF 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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 10924 bytes
SHA-256: 547f4b824068edcfad2c43c8a033a2b4d0edc71f2fae0e88d8bf631a36e886aa
font_01_sfnt_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 16660 bytes
SHA-256: 7a4802d17e6a515f7653d230e78b92be36248dbdf3e7862d6ea6630b416fffbc
font_02_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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