Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c4a4480b3e1b97…

MALICIOUS

PDF

68.2 KB Created: 2021-09-20 22:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d710e89e044c5e6f7eb2c7147a742e36 SHA-1: ff187994e8f41d8cae4146926ceabd1479b1160b SHA-256: e2c4a4480b3e1b970674f71384bee754d4da23dd9abc6f21b3aa7b1d1d695122
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on disposable domains, which are characteristic of phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware by disguising it as a messenger app update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=messenger%2B%2B+android+download PDF link annotation
    • http://yidaig.com/uploadfile/file/20210914040645.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/94835816757.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/zoxewuketofewofuxiwo.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/dogikuzugikeri.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/7626739091.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/lavuledire.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/wawedugonovoxopukeko.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/26670901294.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/56765361422.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/fafofe.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/dulomi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/gozaxipasuwobuzadiv.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/gigexejisatis.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/walatela.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/lanirazusulasaruwew.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46165982951.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u6opr3q2ur2ge4psvdkneckbek/65996991139.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0791a2beca23379db51961fbcec1c8b9/vuneviwezad.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/mozokojalamimetasinigeke.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/67739267210.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9spkuum5u6ac37lhnpj21jfup/konabopilixuv.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/12608814099.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/vutaboje.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_off0000aef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 10404 bytes
SHA-256: 151af50ee1330a22f1f95fcaa5bc250cf6b58358cc5a21e70bc41c98eb39d17e
font_01_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 14720 bytes
SHA-256: 7bc86738132cdd6491c22ac83bc6d7d0135355887e53cb875c2133f45a6bf130
font_02_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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