Malicious PDF — malware analysis report

Static analysis result for SHA-256 6890bd329880cc27…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 01:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc32798363bd1471ce96c238c093e805 SHA-1: cf9f752f9567fa6413b65f982703e2ef5447d178 SHA-256: 6890bd329880cc273b16665283085da213bab9129247eee08a56a440f81f7b06
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it with high confidence. The primary function appears to be directing users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=mad+love+quotes+for+him PDF link annotation
    • https://cualuoihoanmy.com/uploads/userfiles/file/70603488202.pdfIn PDF document text
    • http://pronobile.com/catalog/file/pavirulusipimom.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wavusituvojodevuxaduvizoz.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/dadotupogusiz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c268bc31f5c1351db3537422bd78a621/77406927208.pdfIn PDF document text
    • https://mklaassen.nl/images/file/vufadezaxotuvataf.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/75778953629.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/40945003321.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nujekabusewupavon.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/62884707743.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/jumilevubok.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/megusatadesik.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210924_045437.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145164a44145---kazudel.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/67477827582.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfa0d56e8---zomoworonuvax.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/80c2a78d8847a890dffde1106cfb010b/jumefif.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/desukuletesiwi.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/48460977906.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/70380230424.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ad82fabc---10643202318.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/da5bpiu2fcp0e49u10qkr2vgaf/jodogumorugamujonosasekug.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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 17304 bytes
SHA-256: 633a00a6430b60e0f2fccbee54d9157221993fb82914e632a64e9ff447644c6b
font_01_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10820 bytes
SHA-256: ddeaaad05f932528ad4fcf368c95b5797605b02ee5a639d1b040dbd138fa0afc
font_02_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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