Malicious PDF — malware analysis report

Static analysis result for SHA-256 26535452ed927e24…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 00:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8062094ca9c710e616dfdc52c7e234eb SHA-1: d68b753f5aea21a8e655bc4fe590a6cd4cc4fbbb SHA-256: 26535452ed927e24ff30995179a0715ab9722e6dede47845879010cd0ebb0a11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, with one URL specifically pointing to a compromised WordPress upload directory. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.stemcellhairclinic.com/files/files/debakaluwupu.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ffb3066c7---givuxuxopatewexelimetik.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/584d73e416c9028fe9e73584f1b03f9a/tavepajotebovepetew.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210803044827.pdfIn PDF document text
    • https://nexusmediation.nl/files/88694632734.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/zinameguzonenoso.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/30940309507.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160dc16fcb2c36---96120356755.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/2a8787108f76860bdd9f013870625372/dewudovixo.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/gosubofezigakufe.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/forutavadofoju.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0b56c2cf6dca2b6911ce3aac02cdd456/62537975740.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b036d786db3---rewosuluvujelogatogen.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8e315312---simokovirufolajuweludil.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xixobavagu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b6a7fe2a---69854788621.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/furovazilituwisopawo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/pubeguxujem.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/56514090817.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/grv7jmd1mesie688ov86premn3/zajuxunupemunoluxez.pdfIn PDF document text
    • https://superchills.com/userfiles/file/taximojegesowipodinojuj.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073b41de47e6---37221290502.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d029962963---91579922258.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17ca92ac8---39484585315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+power+of+a+praying+wife+devotional+pdf+free+downloadPDF 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_off0000b593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB593 15436 bytes
SHA-256: 515221aa259f60049bd3e63c59e3fee50c927669a80c49ee89fbff1e45a72ddd
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 10836 bytes
SHA-256: 1dca8d4fefecab0794b93fdc1a35fa4315684c6ef299c1ee6308a4c66205e302

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