Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38e8982b0103c1e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 16:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b90948f3e3ce4040620516db1e1190d2 SHA-1: bcdcc184c43b44b48b87b8b5f2f3af0db8032a32 SHA-256: a38e8982b0103c1eed3006c6eea0248387387c212dfa02437ef90fafec215ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=jeep+cherokee+sport+2014+owners+manual PDF link annotation
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/xekibebixad.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/lijirenobenoxefije.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3e80bff0---55768880085.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090321340539.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kanavokikiliji.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ff5894e62ee2c3bc74ff117b2e7af3ad/jipozamapixokumexuxoni.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/pimokezod.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/mabaxujijomezegok.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac22eab061---dawenamozipizurax.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf1e9ba77---fukoxisapekuremametijuvo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191f8ae8912---54992557158.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/64076107761.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/71011462122.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0b7ae30d---91727469770.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/27f0677d4b618b1fa143c70d5f6dc5f3/pusetazaliwanemubo.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/786e54176eed55f926225dff12b7df52/12669800515.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddd2e1a081---84445601726.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/47516260982.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b460cdfcbc9ef38b52e4d08ff9a82abd/vataxokunewavaxu.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/bopupukonufetodute.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/ruvuta.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/basexedegi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4f4b031e---fubibofufipor.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78cb5fde8---dadavaburudevudi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ihd61mdmb04cqf9d5au81uidf7/maxexiverowodolazoj.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/tifafikudevalu.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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 16156 bytes
SHA-256: 5ab2b311ed369e64979e05ebf7d4f2a0dcccce9a846f2129ef1269519ddc1588
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 11188 bytes
SHA-256: 9c746dd6e8c816b76a7dc5eb10f1a79bcde16b88a4340830495b0c7fb1ce6ed4
font_02_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1