Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd8c3e5647784a3…

MALICIOUS

PDF

85.2 KB Created: 2021-07-08 06:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b8e01bf3391b21a381fe43e70783b40 SHA-1: 6f7f6423334e599cdb9a2e7a2c72a55505cbcf60 SHA-256: bbd8c3e5647784a3bfc45a66f1f6175d921395ce0ecf803e02784ddcd5b053b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e07362fa---5601573446.pdf In PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/7ae3sgpi5e2n4nmvji3b03e4g5/gamokado.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ogff8kjd6hnpv8gunu5o4rijd7/rixosipamixufixuv.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xamuzomobanofebisutaxas.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/folabuvoxuzo.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/gobubakifemijibut.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/runovagomikedegivuz.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/vebomid.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b9ced34b---kevis.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/41d16216a61c1701225d7bb88c0eb6a4/bubibawakoxaxadikefowo.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3d8a41028e9604fcfa55ec83c052679a/godegezomu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69576d0e0---60671961518.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/kexokopegevovokabukedag.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/vogobenavakufabedepitoj.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dobijujil.pdfIn PDF document text
    • https://ocw.tw/uploads/files/76847848601.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f3283625700ac311d6b89bcfac24e81d/86604682470.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ud6gilvpcophdsh1o92n5k8tp0/47961219529.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726be8228a5---gozimisale.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bc89b9138f1a17a82ee8361528885ba0/nomavugokejetefitutiv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a745fb8d177---96894573824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jem+courage+quotesPDF 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_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 10568 bytes
SHA-256: 6b643a0cc431db631b58158589d67d3a99d2967710e7f61c522b4588b36b2e21
font_01_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16416 bytes
SHA-256: aa3fd4546e72bfc3e7f80e076ce0402cf73672b4f78222509eb641beaed7f580
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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