Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a5b8cc40472f2d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 21:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adb1122e17f37019cae1144b462eb3b7 SHA-1: 7d32fd4bd6ba270c6e57585ba902c0c92f8c7803 SHA-256: b5a5b8cc40472f2d9c4faadcbf73f846e704f5d1495838282d25914723ab3228
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fsgzb.com/upfolder/e/files/20210722052614.pdf In PDF document text
    • https://isabellepieman.com/userfiles/file/rorutobaxojexuku.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/39901708638.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/96375919898.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/xagarufag.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/933dau2knt0ip990t9ovnegeub/99480995299.pdfIn PDF document text
    • https://hoongnau.com/upload/files/lonegeroxemubagitowu.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/gapugolagotawuje.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/92cdebc156719e1e5c27adadbef5df1f/10244778462.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608671cc2e70e---gafudawotasiv.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16117b3545b763---lamutedudo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/55d3148bc538c2710ec800cec7e63e5e/78584804596.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vigitonozujanurof.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aa9bcc30baf3b2313edb70b7aad0eb5f/kogedixemoz.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2c41e9e5---malutekexulede.pdfIn PDF document text
    • https://soechi.net/userfiles/file/42439242052.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021619828131969.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/86mt6k7foob337ed3s28kdu2op/xekodexuvosineju.pdfIn PDF document text
    • http://ciskmv.com/css/file/43213508036.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/wuwubifidugelu.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nuluvafunipiz.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/kebuvotiwul.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/buxevesisefibugolunur.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/81299366675.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/katevurimibagiwap.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/17579221966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=enfermedad+de+addison+pediatria+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_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 19024 bytes
SHA-256: c943d5aebe6fdace39be24c100fbb2993d8d10fbf2c26c6e36ea8241937b5705
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 10596 bytes
SHA-256: daecf1833adfae1553ac9d44a83b7e5a2863e6d34522f6fad776fc5a83240632
font_02_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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