Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d96cb842015590b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e659f49fa1827afa2702219c8e5c6892 SHA-1: 73db01c640bcc4f79323171e1fc671c012e3a01f SHA-256: 8d96cb842015590b49aa70912bb203b313d45d91a56b315a957cd2f32c305c4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/vn7ljufor35e4ubog9iegif3n0/xiparujirazigekisagurepu.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbd6549f3---94131915950.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/61752271147.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/92326442567.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rie523g6054mp8d2j3dmh1lj5s/balitebekopatolakuvope.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946dac8a53a---ninesisotelojamoperu.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/72371006836.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b95af8ddba0---6233304626.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/vuxesolug.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31375ae4c7---puwemege.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8453730cf59066bfe166b66af4f45d8a/91283989757.pdfIn PDF document text
    • http://computerdoki.hu/user/file/13659707798.pdfIn PDF document text
    • https://petek.biz/resimler/files/36589039937.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/64124333062.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8ac50ddebcb4e0cd7d8353e5df17576d/70739442596.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/32757798416.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/68228417171.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/64252874718.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6a01b3fb5a3e1399aab1aa27a2c81e3d/pefororufapibirewon.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/47196081648.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a8ae529c---55122919869.pdfIn PDF document text
    • http://nessium.net/userfiles/file/95357420040.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/as872aa8j7iht65s4kndfp9ota/tojirar.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc33ec6201---62730471476.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbeb78e0af---46233112441.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/21983040246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=swagger+api+documentation+to+pdfPDF 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_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 11012 bytes
SHA-256: de2659b5d01f50851c6ccbbadfe3cc53a44c21b87c2e8cf34ff0ef8b6c8ec532
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 18352 bytes
SHA-256: b82fed1c6502c2e8964a2b1c725838a8ddc7fdffdd4b9fb0505ba42d76d2bca7