Malicious PDF — malware analysis report

Static analysis result for SHA-256 668ffb4c74db5269…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 13:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35bb10a994e2cb879578701a3042a830 SHA-1: 8ef15b773b2ed7c7f90c5350286afb643a485d08 SHA-256: 668ffb4c74db5269516c7316199a875eea7797678c98d3fcafc2b96fdce14546
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links designed to manipulate search engine results or direct users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1d9f6a14bc3f558fd7f78315ceef6668/85556663317.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b366b27c---ruzoporutigila.pdfIn PDF document text
    • http://erex.hu/upload/file/nevizixafatefe.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/kqhev3omplqes5bq1rlsrcra63/35165096455.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/14151900285.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/wumurebubi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e1e39b02---31713131855.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/2944453216.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/regukitepok.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9abc22e42d5a7f6847d05d416b7dff4b/pogapanudamanisasudo.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/lukazopozof.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf99410f26---6653711187.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zenunelevi.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/nakawi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2832e8b34a---93788832033.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/19v9v5sbm312f8mvfeicurh8si/waxebedubarafibe.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/e3gji2n236haupihlk2hhbaoa5/82623826614.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/wonapopuvologawemifaj.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/golusegafivinixe.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5258d2e5a54d760fdb0fa23f853597e3/31975983366.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/tiwarixaxex.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/wilotitomowut.pdfIn PDF document text
    • http://makaroma.fr/upload/file/94687569201.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/vopojojaxakasekanomup.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/089e4ce5615419bd457af54cc521bbfd/96551801972.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/jewitezuvogazigewatexolam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=is+lm+bp+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 16632 bytes
SHA-256: d9d44efd33c60c76512b5e38e9072fecdf74a09a946d1523199e20f8ee7e03ce
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 9944 bytes
SHA-256: c989b217485f7f9250e676107cdfb0039943da2fabe7d34f368cf9f29cc6efd7
font_02_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 17220 bytes
SHA-256: bca0d55e63c40042e6bae1488948f3e3731176ded0c1d59ff0b6799a53a4ca0b
font_03_sfnt_off00013094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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