Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93ea9447a9b4da7…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 10:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 689c9509aae19954eaa07607f61c8e66 SHA-1: 665bac2e32388b8b66d6b8bb1c2f7294756222d7 SHA-256: b93ea9447a9b4da7274ea2fbcad345e3dcec8027bfc2e194b77283df27ac9923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=pdf+read+aloud+online PDF link annotation
    • http://gdlejia.com/uploadfile/files/20210810_091437.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60c0eebc8d---ladejabubafedetojanutebok.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/40807160570.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea3c9598cb---51553067692.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/kujugagokemidajibeduguz.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/92072906994.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609161bdbbb74---suxugemodefuv.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/wuselusonujedonefarapotig.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/71441ed3c13820fdcc371f2bb5682f55/vetita.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9ab5e39db---dikixa.pdfIn PDF document text
    • https://securitydm.com/slicice/file/berox.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/suvosopefapusarirele.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/98806040487.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/nakoxitigomabinodanotowi.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/40016255317.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/65432204761.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/kukijadexoz.pdfIn PDF document text
    • http://redactron.com/userfiles/file/rowurovekexuwoper.pdfIn PDF document text
    • http://fitviewer.de/files/file/86716999795.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3b57c3f3---tuzejefotupanulavelawume.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/48658756887.pdfIn PDF document text
    • https://recrut.com/files/files/18209777233.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gabodexefor.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_off0000bd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD76 10180 bytes
SHA-256: 95813b1e0539f3d313baba0e716bf0290480c3251ffaa3fef03b39f299ef7ce2
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 17492 bytes
SHA-256: d3a4175de905f8a74eb072acb0bfe54845a9928443305019aa0b4fe08b57558c

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