Malicious PDF — malware analysis report

Static analysis result for SHA-256 c356a280c510621e…

MALICIOUS

PDF

244.5 KB Created: 2021-07-03 11:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8889249d408fd6969124ffd801e97c7 SHA-1: 55a3bba02022249e114e02a111bee4cd3ee090e0 SHA-256: c356a280c510621e55da2824603daa0ff74cad91243310d74832c53f3435706e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/k9vtflon6k0cj6nv1t3i69ldb0/22217497055.pdf
    • http://agendatourvietnam.com/hinhanh/file/xojogag.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/k58lhmfqlp7th7an31t018l3g0/bugetulinezu.pdf
    • http://synthecinter.com/userfiles/files/4129179320.pdf
    • http://agendaalzheimer.org/files/galeria/files/22406177528.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/92631e10191d2451a0925d5ab0ed9287/bikogisiwimon.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8421365ac3---36325697527.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e02fdeb3a---ziwuzumimadoda.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/82364194984.pdf
    • https://tepihtrava.rs//files/24528547713.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98388285307.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/qo5ftfki0vjk9mdj834157s6mc/67476089506.pdf
    • https://alakharia.com/public_html/userfiles/file/pagozomitugurewojatokaj.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nh7r0g9itt3koql63ti6lukcea/40690528520.pdf
    • http://www.amedna.com/userfiles/files/relomubivatowedugup.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/rizuravipovosejofazeje.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9k69alubt59ncb7h06rjop65he/33886759132.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773386b9f4c---91786665649.pdf
    • https://thefencedocumentary.com/adminfiles/file/kowave.pdf
    • http://phrabat.net/UserFiles/File/91808116600.pdf
    • https://oteaexpert.fr/cite_imgs/file/pesekubavuboma.pdf
    • http://alexhofford.com/temp/files/file/4600426788.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+scripture+is+good+for
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00034da1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x34DA1 16792 bytes
font_01_sfnt_off000365b8.bin
b8bc5b9a6db9761f2bbc35439c6c6220cc85594756d5bb7794fdc156ffe4c21d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x365B8 10612 bytes
font_02_sfnt_off00037de5.bin
cd80895cea857caf3602dd3eeb06b6ae032c6cc8281a945bd7cd7a57a32a51a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37DE5 34676 bytes

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