Malicious PDF — malware analysis report

Static analysis result for SHA-256 d432d40bda97734b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 17:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9385220e8343e13c76280582d968ea0 SHA-1: 4e7350e134ed8d56d0fef318b88b36944ed458a6 SHA-256: d432d40bda97734ba9107bd637e780864733ba5312bd55cf2b2a461f1608a001
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbc6d3019---pejalu.pdf, are likely intended to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ae02c6ac59d3006e8f6c9bd22d0fc7bd/wivaginepavu.pdf In PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/10420150240.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/texojunoviparuvapowire.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/9429118378.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vuxibunelaxusirexi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7c306aba2---mowosiriwejidixe.pdfIn PDF document text
    • https://actorconseil.com/files/file/fufelimozemoxifixonebi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/xokematulebiv.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/riropalanowujujogulej.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/75658604587.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/cf7ed86953bac3a7deecf4152a3b5aea/jugakukutowozukenemexuxe.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e01bec85---352461161.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/50809472024.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/69841242362.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/75458283198.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/63066989522.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/jijazomoluko.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/51808818245.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/gugovajajet.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/efb14394874090c952c0fa016f34f519/59201507688.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a880d9db---97130516752.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073f66fb922b---lored.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/gopevorakubarowivamilesib.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbc6d3019---pejalu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd7a0e128---kupugunonaripemekal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=geometric+analysis+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 10936 bytes
SHA-256: 9122d743777b5012cb7e75c072aad4faba521aacef0907d75a2ee2287cfe4d85
font_02_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 18780 bytes
SHA-256: 2ea9e1794cadd99ab1747a0be7124bbb605de38ec92b36d12b8f01fef411b2a2

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