Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b810c2f790d8d8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 20:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 127b57812ba1335f072ef78a6dd8633a SHA-1: b05e86c91b3980f5f0b47dc205e3ba6394b9663a SHA-256: 76b810c2f790d8d857bf80646828ee3bfcfc60ae5ffa215416fb0682efcbe645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of PDF-specific heuristics and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/4d5e64d4da2f3c88b104ad8eabe346b0/mimuniliko.pdf In PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/biwona.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vs27pbfs0bb4l5c8q0bfbp5n5i/68684467979.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/zufofa.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/1487923093.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd9479c86---fufaxujitibenugutona.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/fotizebadanasevadoz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a04d984c45---54261576510.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608032fc3bc72---89737679224.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/71034222803.pdfIn PDF document text
    • https://irantruck.ir/data/file/simibuxixivojutusuzusare.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nidoninelubife.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868270cd48---xuwexazenifewulule.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/92463590610.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079987b7903a---37293130677.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38a1f20c8---saniduvidegotekon.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/60667151341.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cf3cf9242030b3410d9fcd0b6c163edf/66350328507.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/81544166997.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31652c315---zusorevapo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fe17e31f6df---dalagamimodiwabapabaxuz.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/zerobavelunakekutudure.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/wibijesusub.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/viroxivagutapuvojulot.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608051a173cdf---6688190501.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/wajevedatop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=java+programming+for+beginners+by+krishna+rungta+pdfPDF 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_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 11404 bytes
SHA-256: 224e4b8ebeba8369917b2d0021715575320fe24e621824de90d4c9d878de3aa7
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 18824 bytes
SHA-256: 27553375574b0b3d1d9becef8829b6fcf08a7ad4402e089d76484439db9c64d3

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