Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76dddf5e2191fb4…

MALICIOUS

PDF

63.5 KB Created: 2021-09-13 23:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 883b68248381bb225c8ed4608035abdc SHA-1: 894e988f13a668eeaf085a087099a7f2e7117a6f SHA-256: f76dddf5e2191fb476a908b65a3b4300b089ee4d059c10646af9204bea571778
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8248

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://optimustelecoms.com/ckfinder/userfiles/files/83938432627.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85288441ea5e30a7e2c5720a61543dc4/86344356850.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/rewigelowizufawaxidanojo.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/65215378869.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/lidaraz.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/87260621862.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/25762192505.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109052146209184.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/tokuzadexaga.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/2709888878.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/57666707794.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/8798708540.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/wadarebumikopagukog.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/57073649313.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafcc11502---16383077738.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/97718130677.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/bejep.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/41571519132.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5fe5930572f48b05864844abf8803e12/18051876457.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/jinimusaj.pdfIn PDF document text
    • https://isosklo.cz/uploads/mapudobos.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/5569211635.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/gudusimifof.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/47824464577.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/26532635333.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04a6653ba---96661722327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+image+size+for+android+appPDF link annotation

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