Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4d50b31ced596e…

MALICIOUS

PDF

48.0 KB Created: 2021-10-21 01:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f0a7f6d1d70ba4ec743606baf1cbad1 SHA-1: 759104c18a93be10343e7685f6f15bdb727ce3e1 SHA-256: af4d50b31ced596e121249cbcf44a1db2d7a1f6d2f1234b8f4f18ae91d260d16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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://nedimgame.com/calisma2/files/uploads/kipotokinez.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161698fc2dac16---jagarebukimefaguvusi.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/zutekimig.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/47957039220.pdfIn PDF document text
    • http://charivne.info/images/file/beduwewenujaserawetibum.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/285506_68791472980.pdfIn PDF document text
    • http://newworldss.com/uploads/file/21287298307.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/sasapuvawerize.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/segofozoxetulikot.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/38313284914.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nuwadidubulawam.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/36821282333.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/47984892275.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/75311070172.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/roxifiti.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/4442845705.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/fusarenagubo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0877c84aa---putimid.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/pagiledusurimuxi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616df379e95a4---21418631354.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/85661717352.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615ce3b69293a---97874083379.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=indus+river+valley+characteristicsPDF link annotation

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