Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4db06d49ec1f62e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 11:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b061c6a880355143d39c1b249dc8407 SHA-1: d39040634329908ae5d421704827c6ca014101d1 SHA-256: a4db06d49ec1f62e2be13cdcc518de89dd6d4cdfdd35eaf6595eb83dcc4bebd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest malicious activity, likely related to phishing or SEO manipulation through link farms. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/518cb08f14ad5bf8986148b47e4eba99/mexozobugitafide.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3403dc646b52cea8ea2d111e3e417f89/xetipamabuwatu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/uaeva35oabe4sc3tdntjh382i4/85082381606.pdfIn PDF document text
    • https://alohasafaris.com/files/duruvapedofevakitow.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a105cbf2d487f3650ee6b9c0ca7bf077/47701750597.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/53738927114.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/arls959l2t491f6uujuipq17k0/96708555987.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/66304076316.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210613200409525416pij8o1.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/121e662691c784d233968896c48434d5/31885064149.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/91762928251.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1c1263f0f7de4910f0333658e958978d/91130790103.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2dba77c7---lubada.pdfIn PDF document text
    • http://dakmet.pl/upload/17549208525.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/v07nimjun6vrq3lbu50jfo4k25/38599628004.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/007e2f8babb773d4fbfef1d2f493ac39/fobinikinudexi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a1938b9c---bogiga.pdfIn PDF document text
    • http://kbchina.de/upload/vugegotofukevakafikejoku.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/50617396379.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1602c141---tewumo.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mubatepirotejupetilusa.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4ba91e554---25252374476.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/18460088899.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210825031215146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meat+mincer+manual+reviewsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4A 10516 bytes
SHA-256: ee43fe513dc0a69b0a65d3dc1475c4ffb3cb1b8805aec0ae7b07c6e3c1e1cd81
font_01_sfnt_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 16192 bytes
SHA-256: 46de403e0ddfed4e196484ba398180d4046f4af6c6e90f8b6b36e75ba764eae9
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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