Malicious PDF — malware analysis report

Static analysis result for SHA-256 643d58eddbfcf9e9…

MALICIOUS

PDF

94.4 KB Created: 2021-07-14 05:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9f38b1f1cd556abad982d80f605cace SHA-1: 89a9bb2bfb576d357bb4210cfa677eba684c267b SHA-256: 643d58eddbfcf9e9a90ffcaf085c16e0a1464251f8cbff769d592033c4f0c360
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the structure and heuristics strongly suggest a phishing or malware distribution attempt.

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94645a1112---91635159842.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160971aee4cacf---kexobovexutokutipe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b385eca55---83596242704.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vupidadozagikofejitifuz.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/70068863795.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d65b3a1e8---vigivijewosamulux.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nisinakuwezomipudakop.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wivapimawubawe.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7e410cbf---moduxola.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af210fbc62a---65877444845.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/076593f32fd4367686bd4641dcf921e6/13513634799.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/89435988891.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkru6so30p44ac6eb8qshoora5/pufudigezepolilu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nesiwibesoj.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/89074568364.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/vuwifidigubimufo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/953558e44a653194d8554193abf19653/3177360878.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/67294da78a2965fd11ca419ef1bc9267/57851653153.pdfIn PDF document text
    • http://boldogelet.hu/media/fajuguralef.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d04de154---46938195013.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/61dd85674d557a2f2aae8a17b65f88d0/78384760583.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7b1a9b79---bujojelozozunazobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=technology+is+just+a+tool+bill+gatesPDF 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_off00010d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D49 10856 bytes
SHA-256: 92f9f61c52b0002a3a19efc51a0143683aaa9230e6aa26bef0d943352d24532c
font_01_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 17532 bytes
SHA-256: 499f2b2b7100b87252ed86d071a5b294dcdeb2084865dd8bc9100d60bdceb29e
font_02_sfnt_off0001548b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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