Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e5e3d2bafe4f21…

MALICIOUS

PDF

74.4 KB Created: 2021-07-03 08:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4517917ee7ff874afec349c004856fc9 SHA-1: 52f30336b49fa22245bc3606dc0e063b9816bb5d SHA-256: c8e5e3d2bafe4f21e38dbe2aa6af3acf633c5755b64aadde93202871054dc8f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://dermatologie-chamonix.com/userfiles/file/6852532399.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/37ad2886d293fe2b79d7b755ea7dc66b/58198375662.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a982c4072b---fedowejoxofare.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/86339374195.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/57247515777.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/zizaru.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/rolizuzom.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levilab.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/1939746359.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/44780512886.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/4353500698.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/67598878816.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/pixawurekelel.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/91gohpgtlp8jp6nc4r3t320ubo/3075921575.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd90445e61---13237127886.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/u21dphg8591lrh3sacc0j4dgg2/tedoj.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/69142a9891354d07778c0aab401e30fb/lenapejutep.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2b643598---23273732750.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/loxab.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075a86a1da89---11382903768.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/73015616163.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a661337167a---84058399275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=weather+53012+hour+by+hourPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 16412 bytes
SHA-256: c84db22dcba7434019458c9269032fa4c0a59d3497fb00279e9a7481da4c02b6
font_02_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10740 bytes
SHA-256: ee4d3b9c59d0e8d055db6f5b5f44ca84b5fdddb0604d7689530a9963f8492c8b