Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e007f759a326479…

MALICIOUS

PDF

359.6 KB Created: 2021-07-05 06:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 94ca70050ec4a94898954e29e0d7b1dd SHA-1: a9b8a219614dc8b2a10a5189e4a457ca28aeb3be SHA-256: 3e007f759a32647992dd55284d24ea0d9f1b111218cf96329cc8836eb6546380
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised websites, disguised as a download for 'nfl official rulebook pdf'. This pattern is indicative of a phishing lure, aiming to trick users into downloading potentially malicious content or submitting sensitive information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://archism.ru/uplcv?utm_term=nfl+official+rulebook+pdf PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8441a9d4---10089840442.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6c6cfb7349ba5ad2c7b362e8456b9dab/12776596913.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061020464973499.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0ff9e2302cada68bc317433b41b182b0/29111428675.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc95712d---kezobusorado.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9dbf79859---tezikemipaditefesi.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/13835884250.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b38947d8---lofomajukoruwor.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39742316671.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///lejejemuzumogevubeboko.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2fd528e5---muxaroru.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/watemebajel.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0c357925---72316466580.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083888a5a59c---5660223055.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s8qs197qrgsenq2dpfc0es2r7l/48736922494.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/puxebenadixarujeseg.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/zejigigorukujomug.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ltj21pk4krmucvdnvlb6lc5373/papepejumejofabe.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9197080b785dd4dc7a0cb175cc866ef9/93561008402.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/vbv2dh4h0ot1g7jo9q6fha55oi/9952689479.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2ec202e1a925c28ec32a38456845790f/69522602258.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21f202dab---xitumipimef.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/721d2cbd234553a06d608fbb54388ccd/24970323824.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_off00052fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52FDB 18496 bytes
SHA-256: f5345b2c473f882a441f04ebcfb65bdde04e4feb0367673684469abab6ac895b
font_01_sfnt_off00055fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55FCB 10552 bytes
SHA-256: 0ed8927f35e08bfccc9a034bbf3eca154507cae74a5fcb7e80d371f929a339ef
font_02_sfnt_off000577b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x577B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1