Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5129b330559155d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 01:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b429f940e2555f6ecd43aca7f204fe9 SHA-1: dee40bcb31055b216b4afab229755ce0f80e2a4d SHA-256: f5129b330559155d7ca0d7212cc0f3652f6e99cb90e49ce13182decb5089ccc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=download+free+software+for+word+to+pdf+converter PDF link annotation
    • http://studiotecnicoarduini.eu/userfiles/files/kemudifelamozopojidote.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/pezawujikaweliko.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/jopugekaxepovoxujodasalo.pdfIn PDF document text
    • http://techbis.pl/files/file/45841600277.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a4e3a45fc---10551386533.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/40723679269.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5b044ffa---remewirabebosokajipimuxa.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/88499820974.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e76e2858b480ae880952d2ea509689e3/98155451492.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/motojanibema.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/mavesepatowub.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b0f65573---sirob.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106811137ba5---zovononamutaz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b7e48232a---merupudapiz.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6c7b91dc---9886914481.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108071345177283.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/52788026975.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/41227064541.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160787fa587274---wuluwuxakaj.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/45669296916.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/wemupovojoxopup.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/98005290812.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5390d1ab68---lidurewezamekapumobap.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d828dfca85fd225cfda19c61071aa6ac/suzuwomalisozavi.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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 17796 bytes
SHA-256: cd87dda69cde1e19bac8de5b44df193997f2568077736fedb35365654f3581ba
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 10672 bytes
SHA-256: 24d863e6b937b499efa923c8aa6e24fbae56950c17e465b9ecb2b33427b0349c

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