Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb81acceca1e86a…

MALICIOUS

PDF

121.0 KB Created: 2021-07-08 06:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746aed9642714296440ea71b422a581f SHA-1: 06dd2c5477f0b197e8ee211dc2441bf17efeb987 SHA-256: 5fb81acceca1e86aa3f5191cf07a771683b458635e038a15a0f20deec564a9b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9212

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://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e2b6e0170626c0ecce9ddfd37b0eeb06/zaxusekesadisojemodunirof.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/nevoja.pdf
    • http://to-kajihan.net/js/upload/files/giduneretinefowanibus.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6717e6a3d---muziluxujakewupijo.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/49b61f068950842ee12d1825a13929f5/35081867032.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3b2c19f29808b91693fb319b8fb299bf/57063690513.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/i6ogvbbuqqjektabskdq33dnon/vumugoterekimosidosigeg.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volifonepof.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/880597ce6e8a3ac0694e3aa375a1171d/13169649109.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a374b3c50d---nakaketovogudefulog.pdf
    • http://ceomit.com/fckupload/file/zulavetigedumetub.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0068c46a40f21b710b3d877766b84f00/43924462571.pdf
    • http://douzonebnf.com/upload/file///bulofumamurimetejeso.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cafe09e34---42974606068.pdf
    • http://s-moonlight.com/CKEdit/upload/files/68059982381.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/239a447474c569c133f69c7fb7ea49e1/61558609912.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b03b32706e9b24861d712f36f0be0b90/26410643230.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/53954465354.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085bec976419---vebirodukowomukuwe.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5c8c15d6u63c7gsmal253dl0sm/68921686011.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210604142423.pdf
    • http://lltsg.com/uploadfile/file///2021062603433228.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bed9e8a52f6---51236050761.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rq3cjrup2tfkvlfn7bs5ocm1v6/58218805259.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787704baa7c---51341882545.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6nt00nsq6dcmvvvp2k3d05c3d4/nosasoxo.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e6d2165e---zofopalenugofapaboka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sock+you+in+the+face+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012869.bin
609a6df1cb7220b34f870070c45d54a816d86356c3f7ce6f592fab6799906eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 15292 bytes
font_01_sfnt_off000155c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155C3 16792 bytes
font_02_sfnt_off00016dd5.bin
8e3e1ae15461d25d8465b2bd5c8b31ea3651eb8b06adec64f54621a0b0f140a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD5 19492 bytes
font_03_sfnt_off0001a1ab.bin
32a1b00a3c96451c917b41192e66d4ac227fd7366129f2d3581ed7c27005c868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1AB 17700 bytes
font_04_sfnt_off0001ba96.bin
9bf08031b8dec221fb8ab351581647ec1771b5c90231fa46efaada9ec23959e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA96 10848 bytes

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