Malicious PDF — malware analysis report

Static analysis result for SHA-256 840e9c96f2bf8813…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 09:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc32093d4bb1a5e3bd68c63ad355860f SHA-1: 13c5d88d182ee3f867c85a7297cd018062f47446 SHA-256: 840e9c96f2bf881364110164583e758d00a43b6a45c6e5dc6a550cb3f0a94edb
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. Several heuristics indicate the PDF is designed to host external links, with some pointing to compromised CMS uploads and disposable hosting. The primary function appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3653

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://boschvietnam.com/files/usersfiles/files/goporanaxeriletatuv.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/83b5ab0bb61e9c15d69a89c9f3a3b0af/gavelabakezetija.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/76248303786.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/gigibodusefubemetobukomi.pdfIn PDF document text
    • http://balone.net/_upload/file///vugaratolewenonoja.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/45981122972.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/najesadojemolaxovasusono.pdfIn PDF document text
    • https://arerp.kr/data/file///kokimumupaweranifesa.pdfIn PDF document text
    • https://cian.hr/userfiles/file/gobabimalitekevolixajas.pdfIn PDF document text
    • http://ukrfirework.com/images/file/saxaxinaxobumisupim.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/86270139234.pdfIn PDF document text
    • http://393citizen.com/upload/files/94977212394.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46195a84---tenovuwimujatowan.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0077abdc748eef6833f6d348e71d6704/37832981463.pdfIn PDF document text
    • http://sb-78.ru/files/file/19227758973.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901231716.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/pokironefanezo.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/rulamunopadosivivifeteg.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/57718086867.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/fewawegujovin.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/8253318203.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wonawivotani.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/80435742398.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/64256870980.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/29826501635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cis+polyisoprene+structurePDF link annotation
    • 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_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 18672 bytes
SHA-256: a6d198b2d099c62ce6047f3366b07e4a8827884d137a9fc38501e3cff294f2b6
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 10448 bytes
SHA-256: 678194606baed45c0a6187f57e9c7e5aba034ca136beabb7d95184925b01aeec
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1