Malicious PDF — malware analysis report

Static analysis result for SHA-256 721fd5dc3d81b948…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 22:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3a107e6d0e10c737ea41b1e2bf780be SHA-1: e0c57d3bd447a6d7292ee40cba333b14ac284aa7 SHA-256: 721fd5dc3d81b94834f29505cde5a0642babd097ad7f94d023e9e0d0f0ff5e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=bible+verses+about+sexual+abuse
    • https://foundryindia.org/userfiles/file/wivipamatuzilorasejemase.pdf
    • http://harryreichert.de/uploaded_pics/News/file/moxegogigajipumafugi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6908e4c73---76429196911.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/erm9dasb483gjbkaa7vvobc98j/suledegozesuvatimadebinis.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf87320382---42615881831.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/mogamibadug.pdf
    • https://bodegoncriollo.com/userfiles/file/kobufileviwafelomatoli.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/xabupogisor.pdf
    • http://grafichesirio.com/userfiles/files/18254832357.pdf
    • http://cosmik-kino.ru/sadm_files/68218822145.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b5a53ead6195cf5e316fbc1d7e1c53b1/vubisux.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/8v30218eum0i1937n30rgq07dk/xazozon.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/28v4irk3127qkb921ud4je3am2/sopiwakawemo.pdf
    • https://ctapigroup3.com/contents//files/8224267360.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/fcbd7a44149085a6239a6d95c5d22a11/51770112129.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e429c3d3948---wapegikidi.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/punapirimukevoniv.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44827d6ccc---35035226460.pdf
    • https://tideandtigers.com/ckfinder/userfiles/files/47614648110.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8689ce67---bujupit.pdf
    • http://splogservice.ru/content/file/63864402380.pdf
    • https://xistenze.com/files/files/tesolune.pdf
    • http://busangh.com/attfile/fckimg/file///20210809182612_1015919962.pdf
    • http://studiopetrilli.it/userfiles/files/15744741990.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
font_01_sfnt_off0000f5c0.bin
6aee044610561962e590a41f4bb419c3d9151720b2031ae34d34c4bee6e802d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10456 bytes
font_02_sfnt_off00010dad.bin
85f066f2917c27366c010e923528dd8e1053fa551ee9a75ec91fdb3326203e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 18000 bytes