Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55c62aee5a1ebbe…

MALICIOUS

PDF

82.1 KB Created: 2021-08-19 11:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45a6aaefea0e53cc1b30e85fe87d6bb5 SHA-1: afc98bc84ecb8c15bea9ab81cfb78bdddd629521 SHA-256: f55c62aee5a1ebbea915b15d85f5a6945fa3afd47420e9650b2e229438146e24
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and numerous links to external resources, many of which are hosted on compromised websites or disposable domains. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic for malware delivery. The embedded JavaScript likely facilitates the download and execution of a secondary payload, leveraging the numerous URLs as potential sources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://philabc.ru/uplcv?utm_term=gta+5+game+setup+exe PDF link annotation
    • https://dejavuruse.com/userfiles/file/sanatuminumofesaz.pdfIn PDF document text
    • http://lse.hu/userfiles/file/sanabajovoberokovok.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/tesiginidipoze.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/91539597906.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e56efc34---liveginuxajedulimi.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/24661983628.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610aef6e75ef2---sukope.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0vk6jbt374ik2f9o7pgo7euut3/feguzu.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/70513099834.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5f0255fd0b6cf8f1d627b28ee1e8e09e/83456479246.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/02ea3660adc4f5e488bbe0a325a03d7c/kalupovamus.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d58b6cfaa---pidosumilubumuxo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf9534960---rinepasijisilal.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b935f0bc6---gakoxirukowu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/rolupowa.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/92907788153.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/92116857454.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/99830939843.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/mizonuledugoxiridewegeden.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5nv4jideg5dsgdpoaek8kdd18f/9712796388.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/34313615639.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/26027619779.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 17552 bytes
SHA-256: 148666ac39b2fdc1f6ac1cf7cc4fee8b13aafbadac1a2033a8b2b98bf6fba7bf
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 10508 bytes
SHA-256: ebad0bcd0c5e27b06ae7bcfa042ec2cd19c821dd0256fb6adaa6c4d6b366e014
font_02_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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