Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65038534fce9d91…

MALICIOUS

PDF

83.9 KB Created: 2021-08-12 09:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0ab05f55cea9ff44bb1094b530c9c6c SHA-1: 839c314f216ff263fe64db47937f94058ef787c5 SHA-256: f65038534fce9d91562db5fb4ed5d2d1b8d4e69c136a4de1bdf59aaf49fa2496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://oniceh.ru/uplcv?utm_term=how+to+change+authorised+person+in+gst PDF link annotation
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cda8bd5d87e---99656968745.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0968518792---49942139189.pdfIn PDF document text
    • http://suurelepa.ee/data/file/59327675023.pdfIn PDF document text
    • https://termofriz.rs//files/babefepalevifuzirika.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/zusarad.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1659e6cfd---vizuzedirege.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/67422290444.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc422a10a5---tunife.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/13663335524.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08343c8c20---pelokawidipax.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210703174636.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/25d6fed7befbc0a7a330e74f62a5c7a4/60452203980.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nm3fs5g048ssfr74sn6v5r71gd/pemonidivalegubudolerudod.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bce6cd668---jitusojukizop.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051506555329.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/bakejinivabevewek.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/kodel.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea94f9f225---fixeg.pdfIn PDF document text
    • https://nada70.org/userfiles/file/midumaxibozumikemiv.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/somemuvodevipag.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713536c6c3c---1222651213.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/105f940cfa3699826b1c2aad941e0b30/vonimefaluw.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_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 10924 bytes
SHA-256: c541b2ee26d4e0b30b49fbfdf7191a83b6b721c9d7c9dd7eb5ad58639860b1ac
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 16752 bytes
SHA-256: 11e5026e213a3f9878462df072e185a6a73633cb17da2eeb60eaf1b979fb1028
font_02_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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