Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6169445e8ce0ddc…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 20:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0435bca3b0bbf608a79cc641abb91d91 SHA-1: 39c5167382a1a407ae4a8514194b37bf287a69cc SHA-256: b6169445e8ce0ddce0846cc13808d254fbec6ca9bc487f5b2cbe1b6895997bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory, suggesting it's part of a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e72e16b5---59786331944.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edca70d826---18118003408.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/77673962235.pdfIn PDF document text
    • http://gptools.net/userfiles/file/fikavosakawixava.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/pedol.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/45451480870.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/63335239280.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffee48a114---jalodazakom.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607082706b30c---zinenitolav.pdfIn PDF document text
    • http://ducnhua.com/upload/files/64943713449.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/firox.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2e15cbe5c83e5a02a2fa927ba648d3fe/wawivizirazow.pdfIn PDF document text
    • http://iphysiology.ru/upload/monejavifevo.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/zunamazikojisepizukaduga.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a149b1bdc7c---topazofuxakatiwaginiwupi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7b44b123---zerolutenos.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/sajivisosijemeguzutofemij.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf202f1c7---nakapimukugemetoxazupep.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021061718431470554.pdfIn PDF document text
    • https://jotelek.hu/files/file/55679356182.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b003501085b520758e24ad417c7c73fd/32505838008.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/korenodenenojakokiveman.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fd577184---wutiwunoguvutanaweladoraz.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/kutilexunaselefeximukap.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/mazuwufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ski+weltcup+kalender+2019%2F20+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_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 11176 bytes
SHA-256: 37b45d2255040aabaeaa1db27d7d2d2f5e5529ad220d3fba9fd59c525cce6c69
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 19200 bytes
SHA-256: 7fe963c8a445dfd8377a14fc02f9347924b3dfce0b29986d7e65b583fe686a71

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