Malicious PDF — malware analysis report

Static analysis result for SHA-256 6911fe4146b87d89…

MALICIOUS

PDF

143.5 KB Created: 2021-07-10 08:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b05586c62f73a386d737450116b562e1 SHA-1: b1c400cc33b38f759215b973ec4eeb0b86215071 SHA-256: 6911fe4146b87d89ae94b21f2425426a120f169930c2f97c0c9f7ce672c7233b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of SEO manipulation or redirection to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9339

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=radar+systems+analysis+and+design+using+matlab+pdf PDF link annotation
    • https://chmelo.hu/sites/default/files/file/zewexabudazoxuzaj.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4krkvfqo2rqj7a27ie2afp2qer/90196326290.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/s86ldres8asougv9n7n3qgnsq3/22822902599.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f823fe4293eefead940b8e99310964bf/xuwajabidep.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qg1g0t8l06486o2c2ulragutb0/50977673887.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/71fc672d1e73a97b2cba393f659699d9/purubivabesewafodotadu.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624726705.pdfIn PDF document text
    • http://alptw.com/images/files/vezamowizodeputa.pdfIn PDF document text
    • https://777mto.org/contents//files/zuzojuvajowomeworegu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12cc7f13ea---xatadixomugufusemulir.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77847fa209c335a7d1c15dff42f131a2/42182231361.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/70015673098.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/titebip.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3ea08987---bevorurukabokojotelizosa.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b724c576c3c---jijuselurofozeru.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jaxuxidejaritikomami.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/71849225080.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fc37425d5---46432201380.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/34235193318.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86de4847d---31288903460.pdfIn PDF document text
    • http://hasyo.net/files/file/dobanatalirovilira.pdfIn PDF document text
    • http://capital96.com/userfiles/file/ribudep.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/7954067490.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hnih3ibco8c0l01dulgkj9rt55/vetojevawo.pdfIn PDF document text
    • https://firmacorretajeschile.cl/upload/file/vemaroxifod.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e471a556e---selizasu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acef27735d6---ginotosoxi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB4C 22380 bytes
SHA-256: 20eee07e3b5e68dd878b4d7cf12bfce340ec985f0c0f145986b4ea6e41e13db5
font_01_sfnt_off0001e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E809 11120 bytes
SHA-256: 0a1bc6e977ac6c3fa6d30ec007923899de82e76ab18094465a843f9f6ace134f
font_02_sfnt_off0002018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2018F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000219a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219A0 16092 bytes
SHA-256: 29fa2f2cffed8b46d59586e33217a02490ad06086291cc63fb766f7e89fc747d

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