Malicious PDF — malware analysis report

Static analysis result for SHA-256 264fd97445a56ba1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-16 20:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7efd8559a97712d541f5e1c4abc07881 SHA-1: 1f0d30692e93ab576a5c930623d9ea75c29edf76 SHA-256: 264fd97445a56ba1671bf50f17a096125d6aa7fce84b8452cb719a54b7f8f4f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://manenshop.com/upload/files/43987357190.pdf In PDF document text
    • https://vonia.mikludava.lt/images/files/dawekukezudarexik.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/gegunizotale.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kisijito.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/tojuvutuvil.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/43732554817.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/gefeloxemutawazefewiw.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/89685111376.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/98545634588.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631497226.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/86t8db50hj3oolsdp1nj9e83j2/jivakekilexawexatiwesoj.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/41030767937.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/rimejobi.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/bezinosefotatosoxotogu.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/87497133183.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/somusorarivebur.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/bufesogikukusovipunoki.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/72422725132.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613798767b61f---40653346179.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/841550289.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/ravutupodu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/05529e132af514b40fd958e96e71c71f/2249272636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kwai+social+video+community+apkPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/37685545343.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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 19656 bytes
SHA-256: 1b4928018c800debc6b1507a76d6aabffc90bedc27b5962d0b9d5a0914803066
font_01_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 11024 bytes
SHA-256: e79eeef9ec26e974a2687648a31c8bddf0b68903e51375869fc358bfcd438a9b
font_02_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1