Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57fa97bda092cf3…

MALICIOUS

PDF

93.3 KB Created: 2021-06-25 19:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df23eecda286416b948b7c9f2dffad6f SHA-1: f66774b5e55b92fe47feb5775f3478ddd9ccd921 SHA-256: f57fa97bda092cf398821830186645e3575a7c41e5bf416d184b6730ef0b780b
96 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier strongly indicated maliciousness. The primary goal seems to be directing users to these external sites, likely for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://zafirkort.com/uploads/files/puxexigisefofigotunogagis.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79f546c62---9556446021.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c56166f14be8c7f78bf77c1b3d95447/18628992330.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8069272d27---42747970184.pdf
    • http://brandiassociati.it/userfiles/file/xewufipajifawifuzanag.pdf
    • http://targdenunti.ro/userfiles/file/nutuvezaziforox.pdf
    • http://abwmountvernon.com/uploads/files/mijon.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90e49f0c4---76722912147.pdf
    • https://foundryindia.org/userfiles/file/safepevuw.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i60g0n6cbr38kq02bnug0nt6ge/26652392712.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f81f1c8f---muwexemodediwuvep.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jq1h8jpk4uiiol436auv0krl20/82339343681.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e1af05c1f0c533c48d061e0f46e82f23/11107231142.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a778e039ff8---xunenataxefoketizon.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b6dfc57ef---zusino.pdf
    • http://csptech.net/admin/userfiles/file/genusukifar.pdf
    • http://cariboohose.com/userfiles/file/90393040265.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a75a316a844132b62b57f417b0cae1e6/jonowolesekekizexab.pdf
    • https://okud-istra.hr/userfiles/file/sulewinetos.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b3f9832d---piratugexubomilafofukog.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/sp3dcpdoieqhrth62gvi35gnj1/vaziredugiduwaruma.pdf
    • https://steklo-shik.ru/userfiles/file/vosexunivisixogod.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b7704969b70---sadabaduwerovuviliki.pdf
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/ronagowezamuvarik.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/22e1eaa039398acf3917d9e7596a8c5e/28825683324.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pork+schnitzel+with+ham+and+cheese
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f099.bin
799f28ad9375ee07edfaa73d3d7d16b605281b4e9b0dafb098a31b9a7a3a2ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10872 bytes
font_01_sfnt_off000109ad.bin
2f16c854481cd4b177ee9102efe963d4ae1143ed7c52f37d254015a7c254ea04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 17948 bytes
font_02_sfnt_off00013781.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 16312 bytes
font_03_sfnt_off00014d8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8C 16792 bytes

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