Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d7ee8ee268f2d9…

MALICIOUS

PDF

93.7 KB Created: 2021-07-22 17:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c95f00d6165f84375e16568ff487b26 SHA-1: d707b8cc4ed42ae9b5463d2a703b0e18c853e7b1 SHA-256: 26d7ee8ee268f2d96803819fd129c9f2e6d7a02bd1e9458023f3e7ae3bf3479d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/runuzevosazedifajekonobu.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sja76bllivg065p97ovisol07v/vonunikili.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/52f9c323fb5f179f3b458e9b1ffe250f/57245589648.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/96563277264.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7c83481a---sudafuluwif.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/lafifike.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9f60c5af---befaxuloko.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/adfb5d55538adddc368fe0d2e8797c94/76494487767.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc492ec894---64987658088.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/n5l59jm93tjagea7dtctc59c4g/34606118778.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nusufadaxufujilutiwedot.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10cecd33c9---mituw.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c526a3cbb---wojoladojexesamosi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/85ef88df2d8dd2f7e36dbf52d786e682/40404116512.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/xabawizibiwuxebi.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/40488946358.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ba00e57ce---23843668804.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/memafomosuditetu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/84569683376.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jexevefumijulewikos.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/kofekenezugigexepab.pdfIn PDF document text
    • http://ledson.ru/upload_picture/gudarukopuf.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nonaxomi.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/zegurimim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lost+cities+board+game+rulesPDF 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_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 10804 bytes
SHA-256: 19491dee8b070dd5ccbaecee9af567bb7212b61029580c252658791b2cf1c38a
font_01_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 18048 bytes
SHA-256: 30c94e9a2188098acd8d0d291debe90a2a59273d0045917812ee3d89a57d4f2b
font_02_sfnt_off000150dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1