Malicious PDF — malware analysis report

Static analysis result for SHA-256 6392ff4cbaf7abd6…

MALICIOUS

PDF

92.6 KB Created: 2021-07-03 22:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b0a18c0108f86e26d5fae20f641cd2cf SHA-1: 38dcc52afc5fd061fc7edf5722e946b5df806f80 SHA-256: 6392ff4cbaf7abd6883790c69383e58e3724c63d8d854b1262a5cce603b4aa9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=more+than+one+gender PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc433e92ad---foliluxupefatib.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608857c690923---kevosadexese.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8950e37fc---kagemabakulisuvalitajas.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ca14e1b93425819c702561562a1d03ea/wisiruzozapafeluwena.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/55706411869.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/atc10rce9ju1irt30euvcaaraa/9793345421.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/90416120759.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f5e784de64d564c15f938c89fdb9fea2/21279899839.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a188df4---31916569662.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/lubuxawinatulodimo.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/16366350975.pdfIn PDF document text
    • https://nistd.in/userfiles/file/minelefiwaxasir.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919d8b102d6---32569754654.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4e70cd2a0---11628666860.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/99333618939.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/hfs5ng4dvrplrbqo7mesqesucq/80854926971.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/04a072564245979902b1051c1cee5721/89059981199.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fc9d4b0---36013403330.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/5914732797.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083832277331---zozezonesujubajij.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c03d28af2be2a7a102c027d315f2557d/27699248065.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95581220816.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625304058.pdfIn PDF document text
    • 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_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 17244 bytes
SHA-256: ee7bd61ab5bb71a88dad0c4c1ced739d8937edbfc67ad14a2be3a85ebf4ad144
font_02_sfnt_off00014d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5D 10216 bytes
SHA-256: 4db187088b3a3493149ece7fa31e17a995cac1af91fd610d8f636ca1c436e8e1