Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ead5b6188f89eb7…

MALICIOUS

PDF

92.9 KB Created: 2021-09-05 22:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e255471decdb6326c6ffbfb02e49cd3 SHA-1: 6d2123107812f774a789d2254d366af620316b06 SHA-256: 9ead5b6188f89eb756785a2a52a3c2718a0955cbbe043f932d8f1a522be7b790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://archism.ru/uplcv?utm_term=normes+installation+plomberie+sanitaire+pdf PDF link annotation
    • http://mtreurope.com/ckfinder/userfiles/files/62369641256.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/xewavujizaxidetun.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/rufiwevodikuvipegi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e3a5ef85---lavogusenen.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4be327fa---niwasel.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160744a98361fc---52863501754.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16103a34c903ea---47716113471.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/12618739090.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d81981d---bexituteb.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e751e80dc6---47928764050.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/zoziresesarajuxosewax.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/88868479673.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b384b66c61---fimotubegovokolijuporaso.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/72345480081.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/42373465642.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/60117133749.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160843a473af1e---8084806901.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2158dbcc28---89321632449.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc946af1b---80913076079.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/pivovurojo.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/xufilamu.pdfIn PDF document text
    • https://emmaushuis.org/pages/rizig.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/bofibebebudovekagowusopu.pdfIn PDF document text
    • 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_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 19964 bytes
SHA-256: 1cf60f41f957f6f2c646279399d756a83741b1e7dbf432e101f63cc78c8f360a
font_01_sfnt_off000134ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EC 10776 bytes
SHA-256: 0d318fe21c9450d5d0beee2c658e91e8c167b446996d5dae8ef26ce14a1255cd
font_02_sfnt_off00014d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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