Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15f441d4c86b1b2…

MALICIOUS

PDF

83.2 KB Created: 2021-08-19 19:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17f50587ffb0bc36063b367d033f8adf SHA-1: 657d55de1febf3cb1170aaf534700778a8d2c43c SHA-256: b15f441d4c86b1b2b8f9418c27d3f6e06d3205270a5f2e19b2cdde7b8e5beef7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. This suggests an attempt to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://clarksville.net/wysiwygfiles/file/69034210962.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/cieei6d7usso1i40q57e7j24so/72476142650.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b3242e411c3cd32079724f98867ecd2d/82695802614.pdfIn PDF document text
    • https://conrays.ru/f/data/wutiwetidejexopodivakixi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tuzufasu.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/pogomupuk.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/19722350416.pdfIn PDF document text
    • http://axwelindia.com/uploads/35568255240.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/75968078511.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a66d1bf2e84b65c05329c258363417a8/35111507151.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/59798281464.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/a8c69691a0380b20c9926d7b57f34d2f/savimajaxapokefip.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/37971724c427528dc78ca0ad2e0550cf/bopomisulufuxiw.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zajilup.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/vasewuxagegonifinago.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/61126786541.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/zogasenesadexes.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091015c7a9b1---lobakezuxunudubopuniva.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/nivobezemuropo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/46bdfeaf52cc5e4830a4a9b4baaa9ca9/sipipegulafomejituxepelaw.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/b0kef2f62m99ac24d3cpnn3v2i/33259849796.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0171739a8---nokofazodobisobudavowig.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160886db878328---25845315581.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/86708724167.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/poxujewesepuz.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20ec80c50---33122538888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=is+annabeth+in+the+burning+mazePDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 10640 bytes
SHA-256: f870992347f8dcd23c1d0949e5dd875d71785b2b00b74e2270280caa09814f18
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 17028 bytes
SHA-256: 1d31241a016c4c5bb6e9d2bf6ea57890d810331c8aa0e8855eedea0c5a0e5538