Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e262fb3e986fafd…

MALICIOUS

PDF

118.6 KB Created: 2021-07-17 03:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1b55d5515982160b13d0c8e244d6ecc SHA-1: 26665ea66fd02ede1d3da548ca3fd2780ec33435 SHA-256: 1e262fb3e986fafdb32cb1a2d73a3da0944f18dfbc07f1be32796009fa7577a7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is not informational but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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://aartipalette.com/userfiles/file/dutiderupolikoro.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6935033f5b8c3972876c156f0d0c26d6/74982170834.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d532a4f11d2---17182610716.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c804c0b---70316606204.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/bajukekagimiko.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cc420b9a5d3e0c592b5c3e2650f9f717/rumabuxotowutotivex.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75e81656f---74528320706.pdfIn PDF document text
    • https://ms01bet.net/contents//files/robekezixuxiduxokotiwev.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/33762c4b7e22670cbc783ba3c17bd339/polerobotevukabesidisenem.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d86b236f2---73160421066.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87611b244---wijimifodubosigusivo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84be25f60---bubafevifutuxosojub.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b923c73fc---betitadowurolorajuwuj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c214014f---201103454.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xuvujejarodigudix.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/96433600665.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/71946514813.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/modelanowewadi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4daa797eec7f7ee3952babcb71efdc1c/21190305969.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2ce1d3299---xozadofi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/44709108807.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608878551f892---48149319633.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61313de403---66800710107.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/6cf7edaa414f908aff875aef2c103e1a/viwulinotorixuzuduxekazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=honorary+chairman+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 10472 bytes
SHA-256: 3d957909be8758e42de88c5fbb659f3e7145cdcf2a6a62fc9dd442728d27ebfe
font_03_sfnt_off00013c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4E 17852 bytes
SHA-256: 19ba5f1d37eb5ab22a9758cda37a9099bdc62de6bbbd163528d4c1fe6a8a2028
font_04_sfnt_off00016b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B03 35088 bytes
SHA-256: 42e240af4417e693316abf1b446fdc710ccebc6412953c8365038e0d1be1992c

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