Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd052d25042aa6e…

MALICIOUS

PDF

130.0 KB Created: 2021-07-18 22:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7900628376767a38206e9a03c9a6cf69 SHA-1: f85db922b4d4c0bcb26f0c7e9c748c8404d6753f SHA-256: 0fd052d25042aa6e1b1a3ad5b63cf1c65ed007179706bb74ef57b978aaa2bfc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://aspaeng.com/files/image/files/lifagiliravuburapo.pdf In PDF document text
    • https://northwestconvention.cz/data/files/59252307674.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19a0e6bfef---16405415560.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/gerife.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c21c309e0---puvomenunomife.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/volipomibaxitezezojitawe.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/vazolabul.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6b81d32cae1818b3347c8c628e2f6ef2/jemumamasolodupuv.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/7128715673.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f6644583c54d1d331652e903110a46e2/74144566949.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/lizarodemamaninof.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/708a656b5d5da5d5d318a36abd66b1de/2962529275.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-9/20210709123317266418.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/15673488597.pdfIn PDF document text
    • http://kleiberit.ru/files/file/88011523866.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/0ntrca7m6p9o6d0sm9j80l4tb9/mifubalogoxopasije.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bb4af368---dabilegajabubinunabox.pdfIn PDF document text
    • http://klinok-saintp.ru/files/72826562788.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/sovupuziluda.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/wedufopotosazunonuzaxe.pdfIn PDF document text
    • https://renetravel.ro/images/files/buzilivopewe.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87975bcfa---pisefesominoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=capital+abcd+and+small+abcdPDF 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_off00017458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17458 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_01_sfnt_off000189f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F5 10496 bytes
SHA-256: 2d1850d7074e0faa46a1bc799b67ebcc0c8ea6c1cd767b18b814cd61d3c5c2eb
font_02_sfnt_off0001a18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A18C 25272 bytes
SHA-256: 93db827f4e94dacedba5763072a895c4cc41cee869ddc494fd04b6747abca6a6
font_03_sfnt_off0001e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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