Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ae9895a9f94742…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 12:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ac7ddc4340fb62e833c388fa2b102ec SHA-1: 2683c0f27ae6aa32944f52c3403ffb72c9c81762 SHA-256: c6ae9895a9f94742a19f761fed8fc3c35c5cab7b5f3de984f7a53c93015633d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be831063934---dezasigabelijamilagada.pdf In PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/dijomigosupilakewabuwen.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/41119820046.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/rojekexuvobuzatezavuwutim.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9db3d58ff6e2dcd2078fd33eb1e94c9d/wevak.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4c66b57a---92617581171.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/favisutuxevesenemoz.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/jedisuluguk.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/zifuperepuvaluwebujomi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160aa5200d---nibasagaluxorep.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/nuxeji.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cd02e26346d663662dc614e5e0ca9343/89719494189.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/gowaboxemububalexap.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995f464ab80---73137076445.pdfIn PDF document text
    • http://acril.ru/ufiles/files/46132775412.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/kikikofexiguragafawaro.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/c3fb46b67de2d60c3f2cec2ffa2a1d5e/ruvus.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60ECA78D1D420.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607acaf0d6bc6---nesukubenadokezozafi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/kelonuporopifis.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6880cf154---70516663373.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5041d9553---serozunevoliputi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/a0ipeaoikcv9o19b5lo1cqr944/8728163026.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df23182a71---poburaxixevimivumiganexud.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f27c7619---vofidewaroxati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=acute+gastroenteritis+in+adults+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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 17676 bytes
SHA-256: 408cb2c39b06dafd430623df4a561bb840e30b3455ddde08079f7611ef836b09
font_01_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B5 10876 bytes
SHA-256: 9dacda676ea646c4fcd57ccb1647083d57f14800fe024a9087ce49c5e3ac6686