Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa2d8ab34718fed…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 08:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c35483ae7cd6cd1a886bc9c9d4eb2554 SHA-1: 1dfdc755a7c3fff922eeed114dcfc111a00094c2 SHA-256: 7fa2d8ab34718fed8b4d9e364bed0cf11d2119ab2592c5368b38ea2697b95a7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8756

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://smidgel.ru/uplcv?utm_term=shroud+hearth+barrow+claw PDF link annotation
    • https://netwindowvn.com/uploads/userfiles/file/50873552308.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e4e94633---10931049663.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/62770789702.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/24952114007.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/78684025184.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/71350797710.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/38483967896.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161437b78b62f0---58890824146.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/silojirizoxeluromipetoda.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/xifodivax.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/jusafesu.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/naxadaxagefudoxulebawe.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/kejezajob.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fuxobas.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a75a93f15f75bbe052507907bd2caa03/90561248356.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ea7lrn1o7nbv78ea9q60l0rt3/donodine.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5982f606---55280952755.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1e84908d0fd167ce4fd91f572a9a2ca8/91924576574.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/47460074485.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cb38a11585d8ca036a935c36e01c3318/56400513418.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210917_3741F7C41F83A730.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa33e82ef---48790371455.pdfIn PDF document text
    • 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_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 17556 bytes
SHA-256: 3230ed3cc0c3fb59ae4887381122298eeedcabba2f75e2d65af9967ac2c8155c

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