Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b8fcc716c85606…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 23:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5794e9bfd6d2d5e3016e950edf05d15f SHA-1: dddb929d05fb311e1d2fd66151c260fd826f8cb5 SHA-256: c9b8fcc716c85606c3f4d6e50c075e5104151e5ed40619cb29002110de5fa645
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90fd99881---92800388860.pdf
    • http://etre-belle.su/images/file/28121760521.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc1b4d8b6---kuvizidexulapinu.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9c530292---nurogi.pdf
    • http://sunnysolutions.it/uploads/assets/file/xeguvuribunaz.pdf
    • http://fitviewer.biz/files/file/lumadotegusitir.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/vajigetiv.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vlfjhcb8qilrardfqij2jitkfb/70640877683.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cb9d6546e---wabepotipemefumikijefa.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/71330185310.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609845e9e74d4---17195398457.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/864000068288cf97ece76ec9e46b2642/texotajeda.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7b18c895243ca488d79566705186aca6/nabilividumawasafonipofin.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3559e0b7cd---54128555420.pdf
    • http://scro.ru/pic/file/642314793.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5d3b904865c55de909867c031cc0217a/giderelu.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9efe47bff---pegerorigutuveveta.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687dd21e8---kujokikex.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1525554eb9---5727471093.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3852dc402---janexefiz.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c25c42334---nunugibemefunevoboru.pdf
    • http://mytmbc.org/fckimage/file/dojajomikuvepakidisimur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pathophysiology+of+chest+pain+in+myocardial+infarction
    • 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_off0000f1c3.bin
aff9252e51a8293ea4005ccb97f97f0992ac29e1b4d8980e9224cc0de01bf686
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16664 bytes
font_01_sfnt_off00011d05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16792 bytes
font_02_sfnt_off0001351c.bin
ebf9955b0f45c54f96640bb32b9a95722eb2cdaf8c2f7013b9f898552902fb13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1351C 11184 bytes