Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c525e94993bd94…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 03:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b3aa00825342644a6dfd295753db4ba SHA-1: 536359e63f494b98de454f8ea34ec6c52e219f63 SHA-256: 81c525e94993bd94a577b276b6416202850534e1df9a39b914755a43ab3faeb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a8a8a7c35d9fc10965c03fc47d6561f3/61497487055.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xafarupisidaladaxe.pdfIn PDF document text
    • http://healthywithhart.com/res/file/89048899414.pdfIn PDF document text
    • http://navigator-33.ru/media/file/gezunutako.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a580879afac---wexogamaxuwodimivibisasuj.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/79547780355.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vafoxurupugifigisodaru.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e42fd8c7191---potobububezabadabigus.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/68691358561.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tnb63badr0e4thadcm1q0g86ek/vajuxotot.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/fexav.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/14021373546.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/buwenoz.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/dududumefije.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/womikirutewuxugikebetuwaj.pdfIn PDF document text
    • http://kaies.net/upfiles/210807152850442173lf6hwh.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/63648687745.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8da7222ae4c0b61ba5fe6ea6e7edf09c/17526314297.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc33b242fd1---dedipeniduxare.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/7960380552.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c8b4c9f3168050789a6a8b9faf0ac75e/88157504922.pdfIn PDF document text
    • http://esistore.de/userfiles/file/11412290632.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210830172119.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d34aab84---vutativekawisux.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612364b3d5345---setasaxori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vocabulary+words+with+meaning+bangla+pdfPDF 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_off0000b773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 11476 bytes
SHA-256: 363f41bb96ca51f2d1d80739eeaa66449ab47c9094100041c5e9be5bb9fb1bdc
font_01_sfnt_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 15000 bytes
SHA-256: d3593608416cad9de8b9e0baaf4c097043035f28136c9a6fbd6cc815c8ae80d3
font_02_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 16380 bytes
SHA-256: e20f1319638ac6d62e038bfb61794e41c6722a1afaf37180ebac22a32562fdb7

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