Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03d69aa999a96f1…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 15:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ad417894c423a39efa85a78a8aaa167 SHA-1: a5995d8dd79c48e248ccb81c79c8a38f38edcff8 SHA-256: b03d69aa999a96f146f18d7b492e4ef1c8c9874ff17d1b0a73e1d64f5ece8870
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=logo+design+apk+pro
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u8436vqq8tsj91smm3oo5d8uq3/zozizafitud.pdf
    • https://mrpressconsulting.com/UserFiles/file/57092413254.pdf
    • http://levakov132.ru/userfiles/file/4311313785.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613277af14653---92605660686.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d13baac1---widofokaduxanurewuli.pdf
    • https://voxel-avocats.fr/uploads/file/
    • http://datcat.vn/2018/file/13383690203.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/mebazujuvuju.pdf
    • http://uforoi.com/app/webroot/uploads/files/malijobegub.pdf
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/famajofufikopigoxudopi.pdf
    • http://lidaoxc.com/upload/files/kisepudetusuzafo.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/nobutajoxaroved.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/66119165571.pdf
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/76989917545.pdf
    • https://bodymart.in/ckfinder/userfiles/files/bikod.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/lasejawe.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372b3ad5a2b---28937299383.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/mowisalononoxez.pdf
    • http://sushigonewildtogo.com/uploads/files/nivevenuz.pdf
    • http://studiopol.com/userfiles/files/fejiwudupawizufavetigix.pdf
    • https://digireg.nu/upload/57651488030.pdf
    • https://dennismaloney.ca/upload/editor/file/bitesugiti.pdf
    • http://daoltrading.com/userData/board/file/85739665903.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/32fsgc0kege1grdcgo0ild3se5/zesesisovukadimukezevak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be63.bin
1e2eb08a82280c425324e72a96e1b1219207a2addfb48e997545973a1f0bd108
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 10472 bytes
font_01_sfnt_off0000d604.bin
3f4206fc7585355e8f2eed525ce0cbe356c8c68febbe81876e81a65a506aa305
pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 16128 bytes
font_02_sfnt_off0000ff3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes