Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e3eb44e2be792c…

MALICIOUS

PDF

94.0 KB Created: 2021-09-03 15:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 531fa1bd9a295e7a0b9a6e464b279615 SHA-1: 4b1abf96722b5da75aed9557522f1438d5229008 SHA-256: d2e3eb44e2be792cba78238070b18c3ea17e1dfe22a8494bcc9e83ac0c051a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many hosted on compromised WordPress sites, that redirect to other PDF files or unknown URLs. The primary lure appears to be a search result for 'hemingway short story pdf', suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=hemingway+short+story+pdf PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddd01c033---wizixikiravonaxeb.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wijokavudixuv.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/vekofub.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/33025907972.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd318b824---1601502155.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/84000772331.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a931990b6c5---8658389789.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/35552006833.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/14146060423.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40d145c8c---30109754643.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9ic7449cj3pjhmtn0tdcj26gm9/60452692495.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a70346e87c0---tarefovorodutexo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/3595680755.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/kipad.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbed812312---wasufizexirujojonedo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/59407713924.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eec00db68---mejisati.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b2a53071---juvizadepunokejafosoxutal.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/pozesu.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/mediguzadaxur.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/91777278179.pdfIn PDF document text
    • http://moristas.com/userfiles/files/27018878109.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd4568e4e66276634ae8cd2017af1ebc/35606417278.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_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 17680 bytes
SHA-256: 2007011d1fc9e601905de1caec07af75b4e86fafd48b365b0afad576cd68d490
font_02_sfnt_off00015128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15128 11088 bytes
SHA-256: 2c0710991461f4f39171aaa06989e0e991feaa2d0588f2142d0dfdc12b959f06

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