Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16086c323423ef1…

MALICIOUS

PDF

54.6 KB Created: 2021-09-04 05:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cfefd939ff5957d22f5ad1c1c0bda85 SHA-1: fda44cadd1a8ee8bccc16355f45be4b20c12c425 SHA-256: a16086c323423ef1208e95c4c17a2b97ec909415d75b312cfb7ca770ce38683d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lead users to phishing pages or malware downloads. The presence of external URIs and a link farm structure strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5388

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://sharenkon.com/files/45386436798.pdf In PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/15cdafcaf8f347f840506d14872ec803/63190776313.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/34893876237.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c9e6bi57pbhub82iesnhg5eicc/92288464139.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877fb0ad2d3---7687567632.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d318cfd1e---43181586770.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/zupituzepu.pdfIn PDF document text
    • https://patc.fr/imagesfile/30160117647.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/84394915962.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/vituseniwix.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf80ac95a40---14689594989.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672b8076c2---2177908454.pdfIn PDF document text
    • https://migger.dk/userimages/file/11205497395.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/47347033540.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/22119695280.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a8d9ec62---rajosapixelotofom.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4db3cd664007892f77b9000b46441f44/rusim.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/26a33a6e03119cd3e465946a22d59570/zotalataxuxezafijiwitoxog.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/9723079080.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/vubirivadowudebatu.pdfIn PDF document text
    • https://mackbeks.com/files/file/30867382919.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wewubutukafesi.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xifapozerijawakiz.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a49734d64bb---36405098847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=self+assessment+tool+rpms+pdfPDF link annotation

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