Malicious PDF — malware analysis report

Static analysis result for SHA-256 779517944d45ce7c…

MALICIOUS

PDF

52.4 KB Created: 2021-09-20 05:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2c0390f6c10b5b41dd5369d88a804380 SHA-1: 350553d8078540efb87b6f030d1d4d21859fe42b SHA-256: 779517944d45ce7cfdf3003694f8514e47782f61608e972761943f6b412d79fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6036

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://pistant.ru/uplcv?utm_term=index+of+his+dark+materials+season+2 PDF link annotation
    • http://qzgj.cn/upload/file/14852731198.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/20726cb595b7d8a8cd69e8c8e46ecfa9/40690854030.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/38274910549.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/rurejiduwuwubuwa.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/84770896877.pdfIn PDF document text
    • http://clickvay.com/upload/files/89726670898.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/jinewopalatitawu.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/kajugipuguvonuxebisapewo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cf38d6c970d7402adb544143a2276213/gefovowum.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///94782236829.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/lefupefisivapoxopop.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88ebb3c47---firulurowurazavomapa.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/rodusekinerafefetokirefuz.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/51744332624.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4f4369d---mosibasositek.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/96785660929.pdfIn PDF document text
    • https://hsse.cl/files/16289082598.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/jekowobavanixuletixow.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/zebanumewotimuvilolob.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/nodaviziv.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/e45kbijdg78tdmst425tnj54n6/bubotovokupux.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fcc6a88a85ce2eab2dcb95708b047a21/42129503001.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907172712.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/19585812356.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/wuwevazetirok.pdfIn PDF document text

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