Malicious PDF — malware analysis report

Static analysis result for SHA-256 b643ee77b1698d62…

MALICIOUS

PDF

87.8 KB Created: 2021-08-16 02:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: de64a8116649f57e37e50155540150cd SHA-1: b5719c90441e002e11e76cce8a570e7e1a42fd1e SHA-256: b643ee77b1698d62ba30a7f4d377139dc1f14bc3ed14b995aa6758fd8380ef5a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=c%C3%A1ch+t%E1%BA%A3i+game+hay+day+android PDF link annotation
    • http://96rangjai.com/userfiles/file/durexunulexokukekoxun.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7jjsvaha16um0tpcthqf24o7d7/monuwedekigofewa.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/91707268173.pdfIn PDF document text
    • https://marosme.ro/hirek/file/rebuniwebetoxibonapez.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/39413651699.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad8e2221e---73813781200.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/651452e84e1901cc35e82d1ec33b744e/43388235134.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/80864227114.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4cc7c542e4fd30c5225d1cd1b32399b5/natozugijik.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/88247912796.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/noferofufesaranosawoga.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2ff6e47a1a671e4b7efc404f1a03e4b4/nikakav.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c3753428---93531538648.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/34840965266.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16109f34c63979---xamejufu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c721907927a---39106113671.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/vatulerawugativuxo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/85668178557.pdfIn PDF document text
    • http://domainecomps.com/documents/files/kisuvuzu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ni97r24lbiecnmbtcrcvfi3525/3223054221.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc84313d906---52225985431.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/bojopoxivoxodijenuw.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9a29b27b3582d53211d7fae74e0abeed/70920403543.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9b70d235---80560555667.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22e95385d---86683749910.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/funogixunowibirow.pdfIn PDF document text
    • 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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 28516 bytes
SHA-256: f4c1189e538405bc60cb25be071170a210fcca4e3c175e81ee1d5875275ceaf3
font_01_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001368d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368D 11164 bytes
SHA-256: 1a8a79ed153be49d5cdcb0b06e09a4bc50f77cc19e11dc1cb49da3c7749afb58

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