Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a316ad14749cc4a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 22:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a3f460edc27ab9af939bee403b26460 SHA-1: fd64ba789b7e82d8d0e33c1b476d61a762f2f7f5 SHA-256: 4a316ad14749cc4a009b2cb1b0efc5647704b39e1f5544193b65c0de2a17b91b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6760

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gospelpour100voix.com/fichiers/newsletter/file/73455072565.pdf In PDF document text
    • http://valencia.thepokeluau.com/uploads/files/28388684238.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161337c53d38cb---jinezagapunato.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/91312512235.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/xunew.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/temidixewenike.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301ce28e380---rakixijadaravozi.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/37804073880.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/zonasiz.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/6257983429.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/wuwavobejobugelot.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/96824164977.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/kukolojumase.pdfIn PDF document text
    • https://glozor.com/userfiles/file/50747873302.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/36059822964.pdfIn PDF document text
    • https://desco.scp.hr/files/depemakonafivurinivinuk.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/kowalipabusepilewiba.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/vobedemep.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcc9d8c4d---48571309268.pdfIn PDF document text
    • http://sinoorchids.com/image/file/nibavorarixononezupe.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/wiboxudoposugepane.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/50796354635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=basketball+battle+apk+hackPDF link annotation
    • 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10340 bytes
SHA-256: 23f468a839a341cac4893036c502cee91079538c188fadfdc23879bf27b881e6
font_02_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 17964 bytes
SHA-256: d60d4b5f9f8c7234b50361576b40a92a7c08c8f750f4dc94fe5d0fec19e614bc

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