Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d85a66b9808755b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 16:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e66bca71f5fa53a935907128598c551 SHA-1: d72bf91fab91a8e3c66e2954330db051272f6359 SHA-256: 4d85a66b9808755b560ce1dd62abcb2ab3e9e1c303c02c5f9e2f320c4d769873
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cnhhgj.com/upfiles/userfiles/file/sisifufokiroxusefubipopox.pdf In PDF document text
    • http://wumag.pl/userfiles/file/wevun.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090310112359.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/nemexawuvaj.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/63321258968.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/54510942452.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c07d41e16---55052247873.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/kanalabiviluterikiradol.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/82984125613.pdfIn PDF document text
    • http://full-flavors.com/img/Data/file/59682491531.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/8408570197.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109071907222155.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8f01e4f87394ef997433abadb85d8018/nutewupibikixovenaxax.pdfIn PDF document text
    • http://rayer.cn/d/files/70545487200.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/401ffa4562c49b734579ab9cf5ee73c7/ninupegijopipaxige.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/3755845514.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • https://penal-garazh.ru/files/temin.pdfIn PDF document text
    • http://qdjshg.com/files/file/28641400345.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/77629891874.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/winakulefesogodawezodovan.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/buxotemasav.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985e231a76---76566452119.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5d7477556d7578f761a6abf9a5dcc361/nalesejutokanijunogomale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=easy+2d+drawingPDF 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 19212 bytes
SHA-256: af6b7a6f8b27c25393cf08ea30f44d49649907ce2e7ec65f468e71a2b4057999
font_02_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 10328 bytes
SHA-256: 1dd435f3db5e99b4b676c1231afcba5f3f2d606826fe48bc7f7991883749c219

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