Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e5e5450683b803…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 20:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c49546bb850b730a4d1e6eb068c73bf SHA-1: fcc62d735982e172da03eb901a3d20d925d5575c SHA-256: c7e5e5450683b80345e410d44ba8a31b5f1e3593f2a6faa141825f0440628aa6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage potentially untrustworthy infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608947d339c0c---5804062428.pdf
    • https://deltagroup.bg/uploads/file/25704170725.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2154227f2---purub.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/092bd639c0cad34ac48972afbd0b8109/89648312026.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0v5eb551hhpds8v88c87o4ods1/79012718320.pdf
    • http://innovatepc.com/userfiles/file/22766233219.pdf
    • http://russkiivopros.com/images/FCKeditor/file/45861623039.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48c2f1ed0---8620920663.pdf
    • https://ntwbearing.com/UserFiles/File/miwamokovezodut.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/919370a5ae85c5b41c47cfce9ed002af/vafezabiviti.pdf
    • https://weddingitaly.jp/images/file/labixi.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7auiedbobcjtqptj2coekju429/zofam.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16078960bcae28---delavuvojukamosadexedeneb.pdf
    • https://abeess.com/userfiles/file/5550268174.pdf
    • http://akcjonariusz.com/UserFiles/file/wijija.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gjoqamdc1dc430focnu06o5l13/9756936177.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160778d45e373b---99994686108.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c67f3d16a---lelusegugor.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d63f7a8c1---20831827943.pdf
    • http://ekolojikweb.net/upld/userfiles/file/sumobutamisav.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c7dcb4cac7a0ea9d5f3830094f1a523f/lalug.pdf
    • https://biothiennam.com/media/ftp/file/raderowisetazomirusikifit.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8tfi36i173vjkarvnb4i0btqef/vevimodupixox.pdf
    • http://studioingegneramato.com/userfiles/files/58196620596.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9e7a1e7b24ca259413487ea8d730944a/81923225446.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=presidential+electors+by+state
    • 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_off0000fceb.bin
48e38e1ff293949e3ae2775ae0f7aca37c403574c7f641d254a1c044b039a89e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 16860 bytes
font_01_sfnt_off000128fc.bin
b674fcc5a61862272bb59164c0de8bc4db844201afe04934c10ea5c189e5eb32
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 10620 bytes
font_02_sfnt_off0001416c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 16792 bytes