Malicious PDF — malware analysis report

Static analysis result for SHA-256 6666184746c16825…

MALICIOUS

PDF

92.0 KB Created: 2021-07-14 05:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc90cfc26b0517a9ab65028972e0ba76 SHA-1: edbbb4746a0adfe8a99941a729a445cc9c5d0057 SHA-256: 6666184746c16825443bcf8d0efc69dd22c5c4e4366f0004fc2f4da8dc043435
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The presence of external URIs and IP literals further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c2eba2e3---noxororoxiruxa.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/e8svbcvt4bbcfd4oom3g3qlhs8/najumijugadak.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0c5e694f48bdc0d1137a74dacd560e8c/74857297592.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce5ee306a---58575240617.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/c2eu0d6tfqrmoljppijlqf1ba9/87960697204.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/vufajebobijeremifa.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106290834.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e214c40dee---denitojiwasapok.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/23026156327.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd2d7b0e5---suzejuvuz.pdfPDF link annotation
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/263b79ef6c8236d9158db6736cd937eb/denakisiroj.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608169f7b46c1---jatofupetuxerinorope.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/usmr8gp79sh537vqqa6ev1ham0/19096526029.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/29836512294.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wabufolugadozabilakox.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16211016330331.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6c6d89b3ae9085100b148f14d8522da4/99666794574.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0db64fd1---15111012358.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/69fca09184ffabde7feb1f598a52ccf5/76772232049.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/687de306e04526bdffddeda904f93233/woditaxanemanusavoga.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/cc58c4211071ae960e60c1fcc3ac5de2/pifog.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/lejabitepejuzaxu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd1f38264---debete.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/dirikavitel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=scalar+matrix+definition+and+examplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 10788 bytes
SHA-256: b684b4ceec16a65ae2ee5a925c50fba7f7e8fb65176020a820e914ae42848cea
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 18204 bytes
SHA-256: 04037d112e5ff72afba161ea19f5a5643c41e259137ab52a7f32319e2776228a
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA3 16332 bytes
SHA-256: eadea21f427d7b12c95091ad2cda65a53d84f5401a6a1432f063d1fe05237453

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