Malicious PDF — malware analysis report

Static analysis result for SHA-256 832011869c332222…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 03:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c3c16951016715873943021454c22b0 SHA-1: b71c2b77f2febcceca650905372e7539972bb4e1 SHA-256: 832011869c33222242fa04fb96d9c18081ca4ac4a810d886d5b0e088e5c63b9c
124 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV, specifically as 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be hosted on compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The primary attack pattern involves directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3776

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 http://didocrosby.com/imagenes/file/gipinarij.pdf
    • http://sziszolg.hu/editor_up/ropozudipaw.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/88411050799.pdf
    • https://rocksoliddesigns.biz/userfiles/file/45974768848.pdf
    • http://matras-devison.com/upload/file/lujezogoluvakajexidovise.pdf
    • https://melnikhouse.com/userfiles/file/robaraveliwipifeve.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7912722a2ba86737ff658a1e62ec7508/93822663511.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e60fd6a128---2508721015.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e620e016816---vowutarawekex.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d941ad9b0---vogeresi.pdf
    • https://burgas-remonti.com/userfiles/file/33942762346.pdf
    • http://reelproductionshd.com/userfiles/file/35371199751.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aff0d780e---tobinetekosu.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/vp5lc0gsbmmgesbbhlftqs81th/25352993620.pdf
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/68251343100.pdf
    • http://atthaya.com/file_media/file_image/file/57689581000.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61899205fe---pamizotofotufufujixolegi.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ef0e51de709857534621890a2a3fb38d/47764873409.pdf
    • https://calson.garment-pro.com/ckfinder/userfiles/files/fowufesovi.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804acb904e---lawepinenimofokujulaleg.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897362b987a---95109527159.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/xefagotugarun.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/dadetajekol.pdf
    • http://gesundezellen.de/neu/userfiles/file/nezosaxawe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cuentos+crueles+abelardo+castillo+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
font_01_sfnt_off00010c50.bin
98a13b400a4dfb24d2d1c94226b62ffc6e74133c5780d1365a1305c0dd5b46ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 20104 bytes

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