Malicious PDF — malware analysis report

Static analysis result for SHA-256 511ac5c7050ce86f…

MALICIOUS

PDF

64.3 KB Created: 2021-07-28 07:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cf504dd44eb56fbef2965b69096f0d8 SHA-1: 09c97e15cc03bd2f58e0af889cb924db195396fb SHA-256: 511ac5c7050ce86f290d423932932ec02ead5dfe92c88f8a5e610860fcb66f49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute phishing content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9165

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7915c1ae4da877fbe91470fc494012f6/13112243035.pdf
    • http://kubabus.cz/novy-web/upload/file/33147182222.pdf
    • http://pogotowienaukowe.com/Upload/file/fimexajifir.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ce625aa2---vopamelamaf.pdf
    • http://praguetransfer.com/files/file/xajewasoduzosaxu.pdf
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/goxozixo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d520591b---puvemup.pdf
    • http://theheavent.com/userfiles/files/sazedegofirawibojibobo.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/59300753158.pdf
    • http://santabruna.cl/upload/file/71138539160.pdf
    • https://okud-istra.hr/userfiles/file/denefuxivodenagafusilev.pdf
    • https://laurallo.com/ckfinder/userfiles/files/vedowevugojedigoxeraw.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsif0l2i3s7qcqieto4lg084q0/wuxemi.pdf
    • https://triosms.com/userfiles/file/22915686414.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c6ee3fcad93e9078274dce9545d4b45c/29713627594.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5cd902c1---wulene.pdf
    • https://atl-50.com/files/file/dabujepuzufoxilikofamatem.pdf
    • https://mimpishio1.com/contents//files/risugovipikamavojubazerum.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/396f3a0f107f70d90bf03767f685ad0a/63129032494.pdf
    • http://safetypath.net/cms_images/71204650229.pdf
    • http://wisdomtours.net/upload/file/tutun.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf0544bfb---4872603644.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f18decfaa3---65133471036.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+a+startup+business+loan+with+bad+credit

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