Malicious PDF — malware analysis report

Static analysis result for SHA-256 5815e169bbec670d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 14:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 23d72bfa4d7cdb41507976626e8121fe SHA-1: db1f81cefb1f0e3564f28fd413ad5fe872350620 SHA-256: 5815e169bbec670d2c552a5c7a3a4658e5d3a543457364b359022d5b7c21d721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external resources, with several hosted on compromised WordPress upload directories. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://keralastatetailorsassociation.com/userfiles/file/20172415587.pdf In PDF document text
    • http://blankheich.de/images/uploads/file/pekapodutododurudulor.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/vusiwokaditim.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zurekibonuzo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161363818d68d5---82844681645.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/11297499726.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/ragokazapusunupixaper.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/88485025496.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c74f306b938606db0dd4e02775c49cc1/42223681549.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/39284441078.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381054de55b---4140468931.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/juxaditopozexof.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/xuwikasodisimakisenad.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/nawenesafukulejawat.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330ec1937a7---67311141870.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/23033817303.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/8450379704.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/12051954377.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/logawikowexosisikanoko.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901191210.pdfIn PDF document text
    • http://ihdbd.org/upload/files/92101753682.pdfIn PDF document text
    • https://nls.vn/upload/files/lujefolipejapafazun.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/jebibakepoziperiregile.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/55426858457.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/98552654305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=borreria+latifolia+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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 18648 bytes
SHA-256: e66de93845f23c17759d10e0f564796ffecbf29c2299e6c0c9a937d5ce6190fe
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 10272 bytes
SHA-256: 62d6ece6d51e0e34c1b406ad577eb2bf50c42bb799c39099adec27dc68b98c7d

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