Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e5879d1c1e1be4…

MALICIOUS

PDF

62.2 KB Created: 2021-09-11 01:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3d9f6271f7e9fa7431e08341a4a995a SHA-1: e7b541fca73d0221a84e5a47f81c177c5a3f17bc SHA-256: 65e5879d1c1e1be4db631f4b626d3fb678da0425bede000fccbc517d45f2528e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7942

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://aldurra.ly/images-editeur/img/file/89517105294.pdf In PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/rukob.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6a763309---68601852679.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/vilagiwivusuxedekotajev.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/15074785894.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/30664208457.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/63110346467.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/89224507303.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332233b10f3---93992933284.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/wuzemuvisizafatag.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xotajavarijuge.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/5871195582.pdfIn PDF document text
    • http://zimmerei-possert.at/16959127491.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/ruvogatopoginufenexizuxoj.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/xunit.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gexenareja.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/xajokosiluxejoxez.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613222e1a8968---rodolifetuxamutukuvu.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/jowos.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/23739799855.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/zanusikipasolije.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/38114705331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=droid+gamer+god+of+war+2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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