Malicious PDF — malware analysis report

Static analysis result for SHA-256 c797241b756a98d9…

MALICIOUS

PDF

61.3 KB Created: 2021-06-14 08:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06cbd50d8a83ea7ed5a64290012a14fd SHA-1: e5bd1e8495d721e6167e7cc82129f7a9b2d0e7f0 SHA-256: c797241b756a98d91f78bb5fdeee6a45838551481439bb074db80ae216aaa0e5
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to distribute phishing content or second-stage malware. The presence of external URIs and the overall structure suggest it's part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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.
  • 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
  • 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://wastran.ru/uplcv?utm_term=le+pronom+y+exercices+pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84a0106e7---jifelisatinixufapo.pdf
    • https://alihuata.com/userfiles/file/12145135913.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6aea2e25---33564868071.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6am91d7obejbdmirq0rlum1e2/tewux.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b558f4e023d189b0ee0bc07d4dad6045/bamasef.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905917db3ef---92231117982.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d5184cc7abb366b36e8ae85fa580420/73784538723.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be5fcab2d---44777103089.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/48979860925.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad424b87f3---fefemikevebomexaj.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/lunorimaxupodoxixeda.pdf
    • http://omgmediatank.com/userfiles/files/93820372756.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084256120b7f---jababamaxodobofu.pdf
    • https://aawyx.com/sites/default/imageuser/file/mivegedamisexakefa.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0602357c0---815981465.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160809098909f1---nabilunebajolegikuniko.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/96oc2vkpn0tj5jc9p1eq4rtij5/fojatuwor.pdf
    • http://viewcs.com/partner/upload/dextfile/78009377076.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1b.bin
8f1b9a06ca3b666a174699a2048fac136f72f5dee5a42090991319651ee39b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 5168 bytes

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