Malicious PDF — malware analysis report

Static analysis result for SHA-256 3365a4b0c1221933…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 07:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 92f034f648a3724280d6eab8133ed4bc SHA-1: 4066c2b580d4af6b043505c8001f049b5e9b0698 SHA-256: 3365a4b0c122193312cf084e39ce6b1b164f45333e2ee2c29ff5ec498fc9e35a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=orderly+meaning+in+tamil PDF link annotation
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf3948378---22617946869.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/lusujogogulowu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb7111d89---86596493411.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc30e93db---83396506627.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/xowuroletobolubagiguxif.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/adde8c9f890ea0cb662e1e05210a88aa/90964884241.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f4d06752b5324459a60b0daefeadd114/losibaturinoj.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/4622650379.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/kawivajipasimixomuju.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/86965038823.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/35619265984.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078148f27b0d---29588842530.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/fuxomuvomuxokunetesu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607301d0d2536---nagimororejebuxexi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795972d7192---81871442556.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s19dip27urn7f57li6cimbu360/misamavafagazuzovenela.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsj34bb5sg4d7lobs3qpuekm91/95919164171.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvonismklje6at1b33q4bumv04/26366099576.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/dawasi.pdfIn PDF document text
    • https://vestol.bg/files/file/17084152182.pdfIn PDF document text
    • http://fedoro.ru/upload/file/katuginilojukulokegorulu.pdfIn PDF document text
    • http://creationart.hu/files/file/88807927925.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/23349956653.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 21964 bytes
SHA-256: 68af26caf833fb5de110e69b933f8d8b657be2d86f06681034b9489997e859bb
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 10444 bytes
SHA-256: 9630fb08f836cfe11443ff2892f05643cf25d5b095fd7db26921ac8532e8f983

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