Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa509db331d159c0…

MALICIOUS

PDF

191.7 KB Created: 2021-05-19 07:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e95d755cd915d31199a0f8753069cb SHA-1: 4b0fa7b88f93f6ef07acbf8c11111533fc8b6c84 SHA-256: fa509db331d159c0d92db2dd10c89aadeb9bb75a34d92a5ac4abe04e4f0d94eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns are consistent with a tactic to host malicious links on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=stars+and+galaxies+note-taking+worksheet+answers
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/qkasq84413c4bog3bejaavjat9/gatikijarav.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6e1af6165634612653f8579c39a0f27c/8469867181.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e1233386099a83c34b74895c463fd846/82699145051.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/r8g220avqug770ui0tb00hrir1/86394232695.pdf
    • http://sns.hu/_user/file/gebamukopatamidare.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/zegabalobavikizagizakef.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/28fd491f9c8a6e441916a67fe6694b46/nigobobosurofenevobogogez.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160811ecb29cb8---purekuvigedubibozubifo.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b1dc7d8c---39871851988.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7c82f4f5---zulutisodujekabuwetez.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca1762c0b---28708089152.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ae32cd99---97428070284.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b16325d6d2c0e60e9b4f724e2d8970c7/rugikix.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ljvpn5plrs5u3det67gusllb37/lefoximitaxufosatejo.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad28051c---pikufaxajatotel.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/03f087049cc30388f78c804f9f9c84cb/28151545485.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2bac562b1---tofudiviwusifewuxabeturos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d639.bin
ad071aeb56d8d14215639de75378a6c602cfc071c576da75a968986e10a61e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D639 5444 bytes

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