Malicious PDF — malware analysis report

Static analysis result for SHA-256 225cbc07b5530968…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 08:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a7b28ec4a1850400414dc6cfbb90796 SHA-1: 55fc6f8009f72006b7537cfb10cff38ad9fa3e38 SHA-256: 225cbc07b5530968953eaead5399a2f6d8bf44590ea7b53c17fe9ea2bf26dc25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://viessmannboilers.ca/fck_upload/file/womepax.pdf
    • http://apsara.ru/userfiles/file/lakogevojo.pdf
    • https://wfca-czech.cz/temp/userfiles/files/6940398503.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c589be4e01e---46052336627.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ntoevf3u2jn79p2s4er8q6ih9n/13799821312.pdf
    • https://nevisnews.com/userfiles/30734746724.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4b349ca04bc610fe57a3f9a67585f1e5/zibubamagenuzemetedigugum.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb9c9787d---10699766733.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3348bf43---zosuzedatedenojoxekojezaw.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5bbfeaa0c3fe9596241e73beddfc91ac/foxopobalepilowegev.pdf
    • https://beldaoyun.com/calisma2/files/uploads/newekuvupoxes.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc27121e914cb1a36c90f0df7c6eb2e6/rusizamadakovofexerumigud.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080829902d89---48757536621.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3e386ca2---berujisenibozumipomegu.pdf
    • http://djapm.com/userfiles/file/97553317179.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607413147bec1---84146015839.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6544d9bd---90446442510.pdf
    • http://kleiberit.ru/files/file/mifigewu.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmufeklh58nmu7qj8088siba15/nolobopes.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cbc76722---jeladimagepirilowoxijume.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/219aaf3d8a3c1615e4c14252ea094956/fakolelesemunera.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b72d00b882---66665559325.pdf
    • http://budohurtsa.pl/userfiles/file/sulufunudoloxorovifewage.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c046876c6c8---83700000743.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081321dcb454---20335748052.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/bbd046f50e95ca57bed90248c5ed25d8/27284654112.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=examples+of+being+passive+aggressive
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea00.bin
485a97e7e10c0f87c2a9dea276d458686cefec4b6fb1d5b5873eee9b7ab82e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 10896 bytes
font_01_sfnt_off000102f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 16792 bytes
font_02_sfnt_off00011b07.bin
a19603bbcc272f55cd1e9aa3e3cb7e8bd8467952cb6975ad3dc82ec63bcbef21
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 16880 bytes