Malicious PDF — malware analysis report

Static analysis result for SHA-256 236d5b3a18394124…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 22:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 640406acfa3c095de3e236b94723c8af SHA-1: 39c77a135dab0665d108ef4132ceb7600edca8a1 SHA-256: 236d5b3a1839412422c03c402ad8bdd3159d559bafc4b57748b5de36c3016143
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://fkjz.cn/upload/files/2021/07/202107191548592925.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ec47b85f---vumag.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/30761125472.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf0ccd5dc---40087414106.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c120d84d---tukox.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/270729866454ac55c1465db087acc1f2/wupixidisepamimebev.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/69899340201.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9989c2272---1838097723.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d619f11f3e0---26405106154.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/9d34e705bc9d45a4a56b0a5fd171b546/zanob.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/zefopulexa.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7ffc897be---kepekafajijobaza.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/1453d671551b03c2fd2dc050b0e5600b/57586738728.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acabf857cc1---bezawuwezanen.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/xugalujeb.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611be202a4d92---43071612339.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/87633005014.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78561671696.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/79898964918.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/wexexevipitudarixabisir.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/kibir.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b777dad7316---nexalivegevosodogukota.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210803001052_xo9a0k.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=funlux+nvr+system+manualPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 10416 bytes
SHA-256: ff34d9a5cdd9571411983e200ec2fb11839c461077e2fc9bc0f5f7420d22c716
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 18836 bytes
SHA-256: 2132dcf97047376d83d7f1584721b6857e133621b137666723055d23c7c25ce3

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