Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf2401acdbcc9ce…

MALICIOUS

PDF

88.0 KB Created: 2021-07-06 19:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7dcf657dcee0269925a1c73a4533e9a1 SHA-1: 28cdabd5a913c69350e40d94627728207e4d4ecd SHA-256: abf2401acdbcc9ce874209ddfe006c8ebace60c12ec5e42a006b48da98f5fc7b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It impersonates a cloud document sharing service, a common lure for phishing or malware delivery. The document contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of a 'password-protected archive handoff' heuristic indicates a likely multi-stage attack where the user is instructed to open an encrypted file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rak4ak224u8p7cn16vm6gue254/nowizukiluj.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1b294690---45571006444.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wixidesuji.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa53b9d068---18953850785.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dc33b89e6815c14a42727ce0fc9a56c3/polokiwudilovokobaluzorez.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/9591859920.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd4dbc8c0---rugare.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5ace57c29f47677a4fadf79d79b96966/46317471637.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/wigasubumafek.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/xemutixananutulubamaris.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf132d632---virovakumorevakog.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/631e3nnldq3eucdlb3flf10ma1/72748451560.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276d05c4a3---55295507833.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de3ab7a359a---terijare.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/3311904238.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/vevuvenuvirutobo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/98ca0fb6581404480a4a3acaec0f5744/48143295578.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5b8b4311ba3e7cfb92905f25772979fd/xevojawozekizonopodevoba.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/10093993323.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/384f31d2919917793be5f86c144bdd48/56807247988.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/8149001265.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kooicont6bf2do52jeelbdqu2h/701823230.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/zevunesul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=save+pdf+directly+to+sharepointPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16980 bytes
SHA-256: d49661ecc7e5d0c7ac2629f8b5d1bd1777fc34a55e29387d151bfbba918ad607
font_01_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
font_03_sfnt_off00013901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13901 10972 bytes
SHA-256: 4522744a750efe3c109c2078b1a7582b31c3d69c3c4d090f4fa3fc3cad978772

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