Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bc5614f8860b0f…

MALICIOUS

PDF

95.7 KB Created: 2021-07-03 15:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7018d26bd2ff90c0a0f2dc1d62593bce SHA-1: 92ed26c78a7d7211ce8f037eae107faf3a44c10d SHA-256: 09bc5614f8860b0f53d038f21e1ee4155b3d8074523420ad07c5f7d212e6102d
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. This structure is indicative of a link farm designed to host malicious content or redirect users to phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5103

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/3689663eb7086333cc5640618b59318d/38329938434.pdf In PDF document text
    • http://rogo-rotterdam.nl/files/nerexunofajilijavumofib.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a44a6dee1---vafegaruzosub.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16073998a1163d---67748568740.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/35664230882.pdfIn PDF document text
    • http://01host.ru/userfiles/files/34635161080.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hlvlo6f8m6r6gtakjmmpatvgvt/fumidod.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8a2621c2.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbebc725e---popobak.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/emrn2ph0uvbn6gtsktb66befd9/vulobadaxepeposoxevufi.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/vukuromatabofurike.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/e9334157e44b9fb927507a10ea5ed790/17078740288.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7fcb1bfcb2a91d3ecdd7cc49c4dfb8c2/dufemalimejis.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/vijetebotulup.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7f121636---81197612433.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/xokanupeseriwa.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/zelusutanupododi.pdfIn PDF document text
    • http://willbramephotography.com/fodokujul.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/eoi57uvk2kcq1llh1d7u5pcnsg/87281952060.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/sikimubuwabep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=connective+words+in+arabicPDF 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
stream_004_off00015756.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15756 24946 bytes
SHA-256: c238db734c5801c7b46f64dc9ae7b614387be85c5db4bb54128ae2bbce07b78b
font_00_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 19132 bytes
SHA-256: 7f9fbc8c110ceaa12acdb09eb75374820198a1621e78209e9585ecd4b86ede23

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