Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94d27c5524c8f6d…

MALICIOUS

PDF

80.0 KB Created: 2021-07-21 16:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b12313e93db0b739894392c812223237 SHA-1: fb96ca99083163ecabe9a20c923b78a916f69e30 SHA-256: c94d27c5524c8f6de6c5eaed68aa10b0f429053a1173eca6c966b181513c18cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8576

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 http://mega-stainlesssteel.com/uploads/image/files/semizorovuvimuvowagej.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/27361754371.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/657d3e4398e476cf42df5851dfa1a3e8/fogadojikufitinupurapop.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///60047789845.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86732e67c---fafizuxizopazajenawugatud.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/21a901b2ec82437edccb1bb411c47a51/81228650576.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/dumizasorotizipaz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78fcebb8aa---jerekitixisoned.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ef8ce0bf97184ecc8e04f8a087033855/suviwa.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/mezifezagoke.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a42cefc33aa---22625412000.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdd4c77b7---96351323063.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88505473910.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nusigoxamebaze.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3156bc6f82---71389266529.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb95acb36---retituxujopumazolovabowon.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/019983d5297553e3f644cb5a3978bac3/5287222666.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16217971564194.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/gonunomoxazerilepofelavi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075224c72b59---merafoxivase.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/loforijuxo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/08h0p8r9t4bpilkd37il38hfuu/15037529566.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/wojodepetek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=us+quarter+dollar+coin+to+philippine+pesoPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a891e28c322f70fac543f0226c56b866/76292131.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_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 18268 bytes
SHA-256: 7cd3cbe2e299d9aa89dcc8bdf028f3ffee5fb69ad6372c896097767e0cb3ac0e