Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b97d0450084ab7c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 17:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47e008520fae6cba692cdd770c29be82 SHA-1: e0027ee61678c062ac795af6ed62a9a95e6f2297 SHA-256: 8b97d0450084ab7c2bc7424a8af502e2f0c7a9b272070695e6756bf28fb80bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting domains, which in turn host other PDF files. This suggests a phishing or malware distribution campaign leveraging a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://gillyard-johnson-mahoney.com/clients/62114/File/sudoro.pdf In PDF document text
    • http://splogservice.ru/content/file/komazinoxuso.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/wenivebejoted.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5bbb7c4ff---54521041329.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/84587310124.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f82738e5e---95744073414.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160beefb2176ad---63189430999.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0f1a6e565b07d60965e2f1027145e8cf/wewuvugijujubu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/48660769592.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_210329.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vajl9i540opn9v6dk68afrd70r/fejifufusefutexutejido.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a000d1b32df---85794155829.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/kisokuwenapepeduso.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210831045906.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/72051253322.pdfIn PDF document text
    • https://clinicscrm.com/img/files/42579909901.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/63887673567.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/36824732389.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/bogusidozowok.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/63594650043.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/33155667510.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/27959253687.pdfIn PDF document text
    • https://poker-fire.de/file/96752812028.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a0986fca09a---43340519900.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d126e18e19---14862945157.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/gebalisunedumoxinakesak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gejala+klinis+marasmus+dan+kwashiorkor+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_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 15196 bytes
SHA-256: 990dfde5714eb6528242dde71ea8f14c4fb9403eb3b49889fe3250f5c4ced970
font_02_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 11112 bytes
SHA-256: 4eca9ffce5fe47a640b2cc70b44ac099dd9673114d625fd0a72a03a3d5d989d0