Malicious PDF — malware analysis report

Static analysis result for SHA-256 470c81e87adc1ffa…

MALICIOUS

PDF

80.0 KB Created: 2021-08-13 13:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1ea117420fa01a48fdd4fafd6172bfe SHA-1: 57965a5f20de08116b83ff8c2da3297ba01cba26 SHA-256: 470c81e87adc1ffa415f40481ac0b87aa54c1bd5c8ebbca0ad18554bb96bfd2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5329

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=libro+de+los+sue%C3%B1os+quiniela+pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160783f679d446---96889529205.pdf
    • http://caycanh.vn/images/fck/file/vozirodurufu.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e60fdc359---mivojinezonofadisiz.pdf
    • https://absoluteanytime.com/media_file/files/files/rapisutatemenu.pdf
    • http://www.anclupnapoli.it/userfiles/file/tujub.pdf
    • https://mosallaesf.ir/uploads/ck/files/vigusabu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/940c8e158ca29bea5b3f6aa815cd2874/16166046620.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/dc2cba0a5a1398abebbf16f77400e30f/dexuper.pdf
    • http://normel.org/files/upload/file/pagob.pdf
    • http://harc-ias.vn/Images_upload/files/munilodar.pdf
    • http://studionegrelli.it/userfiles/files/73771049554.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/xipategisuguxevaxagaxukid.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/nupebowozasesolufosijib.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7ad847be---napufuvemudarog.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1a4bb4b0---87405734224.pdf
    • http://centrumbiznesurawicz.pl/userfiles/file/lududomipi.pdf
    • http://joinsocialbubble.com/cake/beta/userfiles/file/17923282405.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/imlvqaq55o5eeq75qe7j8kcpgn/56190532152.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab152d066d2---falomimefixuxijik.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2e0c093a---1057071331.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807123b62cf---21651634117.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/fb0d2e7615f123bca35ba0975ae05a60/kajuzelija.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d1f40983---sefavunomozikanaleno.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/48rp8ugj5ltt5tl714qsetboo5/wuwari.pdf

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