Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cd27161de7fd73…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 13:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34388c2331989ee8ed8fecd6910eae5f SHA-1: b18520d60d18c2081aefb5ec8191ef50a4bd871d SHA-256: a8cd27161de7fd73585c2850377cad6ad7045f28ae6453303ad60747cebe074f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614476222a4e0---44454107071.pdf In PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/femesoxamegaxediremubar.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/52593659316.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/65125347720.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/petinuxetapif.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3faf1ccc2---juduvajiv.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kesurot.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vimutow.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/gizerovuzironozabokena.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/2396466781.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407381b4757---39583801988.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/firezirixopoxatexixateni.pdfIn PDF document text
    • http://fnathservices.com/upload/file/39976615657.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vetelabedunirepapepapipaf.pdfIn PDF document text
    • https://ptogel2.com/contents/files/82334912325.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145363b162e9---35229249708.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/81136870007.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/28232470462.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/27229358792.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/zekugufe.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/95010882419.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/romakamodovomigi.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/14284495953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bible+gateway+app+for+android+phonePDF 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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 17844 bytes
SHA-256: e7dbb0b0835d519af1ff74ca625b6c5daee10e62acf8284d8116d590c861820d
font_02_sfnt_off000138f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F2 11000 bytes
SHA-256: f5f122703bc9bcdfd827bd5682561fc7dc038802676ff93e5fafa8e09c80d390

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