Malicious PDF — malware analysis report

Static analysis result for SHA-256 76522e76e45d9479…

MALICIOUS

PDF

101.8 KB Created: 2021-07-16 14:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b54a7ba2c6dad52877533f72c2bd6f1e SHA-1: bd8e267f26fcbb18485a19d8ffde4d0626c2bf6a SHA-256: 76522e76e45d94799bc9064fb2a7e20b1d3870fee4c6aac9430730370d681c31
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings are sufficient to determine its purpose as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=meaning+of+traineeship PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/b40t98qsh0ucseiinu6j3f9eqi/laputokivopexajegegeleri.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7f8f710fa07165b2b6642fad2dffe58a/gikapugez.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe14082344---forefuganepof.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608284930c374---25524838516.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64010a1cc---fuvitetebokiworavi.pdfIn PDF document text
    • http://merwepizza.com/upload/file/4340857093.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aae040902---jujawelawumikaj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7af7943ff---32686603081.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/bijomofesisove.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/pujonofuluwek.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/80fc5cf5409f0fd0706c7c8bc11a1974/nekixozesagijej.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1a67082---93782594839.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/dd89611ab233f6c56d4f7fd3d0bb7ced/46068665480.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c24853311ce---68954308198.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/guxiduvedusab.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/kkdjpt96bp9dqpc4f0lf3ckfb4/97814178023.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nenepudedubego.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd42defe7b---90352777095.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4bk0jvj8ko9bi0vom4u2jjedrd/65918465156.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/sukijevewor.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/rabapifarekuvesubewuj.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7878e0364d3a3e2b414cef198e67900f/fesutalebenunixul.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/77866d5400a5327c53a0e711c947fdfa/todiniduxolelogikadi.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_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 20476 bytes
SHA-256: 8e451e4432f1f96fa96227162670286af42d54fcc1ba806b022fabde6a3dbcea
font_01_sfnt_off00015a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0F 10584 bytes
SHA-256: d725dc19089109be39e97af8d01bc652e3371b94702e88710653038e1a6bbeb0
font_02_sfnt_off0001722a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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