Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bca167e82c654a…

MALICIOUS

PDF

95.9 KB Created: 2021-07-03 02:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e6210418fc20a7f1e1e34c7fbf94bdc SHA-1: decd11b177d5464817f47fbeb4eb750e4f3a8d0d SHA-256: 23bca167e82c654a15719c6cdfe834c5433484ef2bafb9b3498edd698c4f146f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or lead to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2k7jmbsccak8bubotiq905h1nr/lesobo.pdf In PDF document text
    • http://abwpetersburg.com/uploads/files/fiwavimarewevam.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/dowazosujupenuxo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/03fc35d450ed95e2873921909c1683d2/wizitifinowusibadelodux.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/69383657868.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/xitisabesigixezu.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/dfbb317ae2902e8c241e865be6de00f0/76037807998.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f69491bf---13013351138.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377bf03c76---kamewifawadiwori.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/600927a1154b565cabc2e1360ec781df/zelagepunilafidabinu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/51fugtjb2sghdvmj24ocnderh4/41058172088.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5d0ddbbcd---60326904480.pdfIn PDF document text
    • http://jarosi.hu/files/file/21017729480.pdfIn PDF document text
    • http://teifsepahan.com/files/file/dixigutivaretubasumo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/12cuqqp1a5b6r07mamtcf8796c/muzakodigif.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ec303ead---46124452508.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d39576245---kamadatezogapibewinew.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pinubatujodabi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1abfe1cdc---vafejeman.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/oi8eitl5v3ujs8ph2793qcukso/48389747549.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0b2d6dae---70089507541.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/womiwunepumoxipi.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/faxepafudojikezuforesaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fce+reading+and+use+of+english+part+7+answersPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 11112 bytes
SHA-256: ad7a3f594fc9b1dfd49f31c0166d63e9c00c3abad3fce270ce8b50b5ab96a08a
font_01_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 18792 bytes
SHA-256: 37644499902c7b3a5d6f1aab66c6637426422b53bdd67ffd74dd10c9519ef49b
font_02_sfnt_off0001433a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433A 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00015945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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