Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f362c157072c0a2…

MALICIOUS

PDF

95.9 KB Created: 2021-07-14 06:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ace0e6fed47743a214c328e2641aa33 SHA-1: 47e1add746ea2713dff9666f4f64a3bd87ba8ec1 SHA-256: 9f362c157072c0a2fa1e0bd56e454929cf6248e24220c14c86088d59773e96b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure malicious destinations. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://musikkursus.dk/userfiles/file/fuwanisez.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9e22369d---zulopono.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2896761c2e863e6de3dffa38ef24ceab/dojenelobezivizag.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c7a8fdd7---bukoralo.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/61174198517.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f72a66a2ecc481ac4adee682f670a98c/voliruk.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f40a9404d---73302128087.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e7b1b517f5e80cb12829a87eb96b2d73/motufibumuzigenapigelape.pdf
    • https://soechi.com/userfiles/file/mekoguma.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b184c201d4d---zaruxabavugejel.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b8183727f4b26246c7255f6070c6b04/66732407198.pdf
    • https://pet-fashion.ro/mm/file/88071495086.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d40d2bd37f0adccde184964d03c24e74/gofiriwavojaro.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zigizigupatadatowokep.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/gtfq3f6j01ari4d3gh5q87fahg/84922540415.pdf
    • https://divinenine.net/userfiles/file/rajunusiwugofepemegeg.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1752c8ece---33584551894.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5e3ebddf8---13270126090.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3400d42f4d1a106c78b2f1dee839e328/48219007649.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719a868deca---nomiva.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607738f6c19e6---26676230647.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/df01f1203e2050b1a21f8ec47ac768dd/11626065822.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/fipob.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/886ee95245b8583fe145837aaa4aad82/38348331005.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/1dd6c217a9271e82387eca0e4e97312e/kumisozuwoxorevilewozir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=unicorn+rainbow+colouring+pages
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b0.bin
eb322746d3ac072accb1c1a7b45cb2045771cccdb816429b7739c844d361bbfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 16792 bytes
font_01_sfnt_off000111bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 16792 bytes
font_02_sfnt_off000129d2.bin
2f13518d1ff2f9ccac8f2e0f42e46b902aabf3bfefcb70e9d6b42eaae3c1fbbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 10784 bytes
font_03_sfnt_off00014294.bin
df267e58c2b09674b4ab432ed3095f7cc570dd36c161e2c6b26d5b81ad14a4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14294 18168 bytes

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