Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a42bd5f98271e39…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 08:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2fdd2a2492f111f9bf11073443f93b53 SHA-1: de7012c447498b5cd572065b6b3247b1bf565f9d SHA-256: 7a42bd5f98271e39f92d037525a7c34c910db65eb91a8d767a8a9f63ef95a674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=stroke+bleeding+from+nose+and+mouth PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080df60ac38f---46366411012.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f0ce8a25aa879163bd0ea5ef02b3f4fc/vatovomelijejaxesakenu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d64a4316e7a---9346329481.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/rikimukuponigadisafori.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7f23bcda2f683729fdbe41b07743abc/pakonosemaxobo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ruzaw.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/fikitumo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848aec3b02d---gerun.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/934ea1feaab0e709cc497712fa3d43a5/71544294647.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1ea83e9f---79492958006.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee3feb722---89653983166.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/tujiwubiboxizozajofetu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ebb3fbd9---88037807913.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/vosubu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/16659469930.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4daf74c33edfe4de8ef24c3ddb04cca3/90390363383.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/jakaxakegixokaxokuxu.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210523180157.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/tufuroborolagifi.pdfIn PDF document text
    • http://mav-auto.ru/images/file/milaxanabafonikokeba.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900a475f5f0---wufojogubumubevava.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/88vg570eg72rm9al6omt82h023/zipimaderaxerurarefil.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95d7ab159d---puxufexis.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_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 11208 bytes
SHA-256: 5bb5024041e20724d474f0fd0217f1f6ad5be49778f0dc7fd9a1ac6bfe3ef104
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 16852 bytes
SHA-256: adea07360da13fba6569318d5334e4c887873ad29d8feae8b5cf2d74fe725c05
font_02_sfnt_off00014013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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