Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff356d1c28b5cba…

MALICIOUS

PDF

54.6 KB Created: 2021-09-02 18:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3608e66e390070c4796784528a22239c SHA-1: 43e1cd91de3a8315eaa5ae656452ec7633ed7ace SHA-256: aff356d1c28b5cbaeabd5886fa1dfff11964a7af7b3bd9ae654f4908a9c292f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5305

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 http://thuduchouse.vn/pics/file/15312335535.pdf In PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/75836660890.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/4985813660.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b2f88ecde---45799780034.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/fegazujigobefitijiguwu.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/10919056320.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/26717861108.pdfIn PDF document text
    • http://acril.ru/ufiles/files/47354975532.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/tegapajupudulopado.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tilenakilatiri.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c6e07c0346bede74f0bc165da268fd77/20912798352.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/57746690516.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/63567965187.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/pezuvofegivobubel.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/48149262840.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7803171be6491a9703956d3aaf130780/mavakiwopa.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/derubidiwawilanoranefexu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609becd64d339---67626615564.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a96d10ad---71812580753.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fivezabovekolerisebiji.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebd3f35c0---76823471998.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/37467832201.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8nk3e1a6258nqr0udsmnntg4bu/rivomivapanob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=elna+792d+overlocker+instruction+manualPDF link annotation

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