Malicious PDF — malware analysis report

Static analysis result for SHA-256 287c03c9469b58e8…

MALICIOUS

PDF

196.7 KB Created: 2021-08-20 02:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 654ee81bc6486ab9c1929d0fe5f3744d SHA-1: 8dc51b872551f859d355a0168e8de469c80922d3 SHA-256: 287c03c9469b58e80aa51437df29d172d658e1e417605db6a525c2aba6c6f61f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards a phishing lure designed to trick users into downloading additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9710

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075224c72b59---merafoxivase.pdf In PDF document text
    • http://jkohut.pl/file/94124419133.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/32674243777.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/41e65e04a75ffe4b4859b09baae8644a/12886658326.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sulujajuburokap.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/bereba.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/34149474138.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/89409926588.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zovusagilizegosod.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vigawi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7b65237e---wikebebolatabopu.pdfIn PDF document text
    • http://sun-tes.ru/files/file/6373744120.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/114bde663ae2913a28d974f7fc1f6143/34769580644.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5c723a700a61d5aba89dc337bff647e3/zekegidolazowipinos.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/xapavazugorukutemubi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/66fb72b67c7563409f4083308b27ab73/nupuxazutasowugulepir.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/7644552087.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sjrhn1i1lgk3s5ukslh1app31g/minumumemosafaribagudi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/05159d29b7f0b20f3261895a351db153/53969438429.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88402d3e95---15648762034.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/94239659390.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b14ba4ba---44912243606.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/79642066636.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/jifiregasebajededupa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4de18f202---80303077407.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/86950618692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=11+fizik+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002a59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A59A 9668 bytes
SHA-256: 129dc454a2529b1c82ff582a75690fd736bc893b04acc860f697968b51a458c9
font_01_sfnt_off0002baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAAA 18492 bytes
SHA-256: 5bb068663c4770671a335e42562fe9b1a0653d681a9286b702dbcbf4632a4e0d
font_02_sfnt_off0002ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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