Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e81e7017c6610d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 16:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cac7f226fac706fcb0c17b697be3bed1 SHA-1: 2f1ac532683acdd6f359220ce797afacc62460fc SHA-256: 18e81e7017c6610d6e6bc1c30bfc3f08c985956d5373ef10a325787a8dc16dfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=free+spin+casino+no+deposit+bonus+codes+2019+australia PDF link annotation
    • http://sowa-architekci.pl/userfiles/files/88122304277.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/93980272041.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc41e0e5d6---33387474727.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/64921801745.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/faxifawapevefizijorukex.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/45871645537.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/wirefijipuvogupojoxota.pdfIn PDF document text
    • https://music-group-store.com/upload/files/31409644426.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/tolekajo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e858cd539---3298902439.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/fepobozigiwurerugi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133edef25e2e---72682124701.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/weregatof.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/dumobi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/sexavobinizedejufi.pdfIn PDF document text
    • http://postelezmasivu-praha.cz/ckfinder/userfiles/files/48968002256.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/52702609505.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/dinuke.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gafujesunefadameve.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/7012998072.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210923_3CE5865B64809564.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/23d332b02c46d1ba017db68a6aa1e0d3/88206502488.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/6472278445.pdfIn PDF document text
    • https://basisnomor.com/contents/files/79702193834.pdfIn PDF document text
    • 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_off0000b176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB176 14428 bytes
SHA-256: fee968389a15a29484385270bc05bcef740a6bd3fdf0c9fc40ea661e24526350
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 11184 bytes
SHA-256: 0886aa18e5dcd66152a8a99b1eb38fb3ab8b6d949bcf2e3e689e6ebdba5a12bd