Malicious PDF — malware analysis report

Static analysis result for SHA-256 3762ad0fb95ead6c…

MALICIOUS

PDF

85.3 KB Created: 2021-08-20 22:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c90aae2fcf8840366405f82d2fa83a0 SHA-1: ff751a64a003f0a4ebfa4ed70253e607e2834db3 SHA-256: 3762ad0fb95ead6c57a6ded7c967ac10abc32f99725987f2384082cb2740ea1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aawyx.com/sites/default/imageuser/file/59771190354.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b99317eba0a2838285c0723cecf19e95/tajixubufu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/56831250649.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/13995223651.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1aacc3f9---bodalozukizimidezes.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/32fee63466021e86c62155b9d81dbdbd/togavu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hngi5atuu7ha4qrh1vdnccp0m/wekavin.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/lekuduzowuzanuxosanux.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/folezakiranoponorogu.pdfIn PDF document text
    • http://skupka54.ru/upload/m/numofo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/8594747999.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/lizelunoxexog.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2002946e27ce2cc1c871d2316476435b/vikovomunoputinaf.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/zifefexuzibawizosewom.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/rikera.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/ximodonututegotobe.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/sideluvuneji.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/66471097080.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/81209242331.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/finifekaxisotojuvamutome.pdfIn PDF document text
    • https://codecs.ro/images/file/15463076023.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9716ec25---41680232975.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e64344a07---48038328608.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/mifefipetezuwewazigi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/livuxidexanowor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+dependent+and+independent+variables+in+pythonPDF 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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 10992 bytes
SHA-256: 54086cb351dc847768d94217aaa78f4c8519995ce0aecb4622b690db4f7d4968
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 17168 bytes
SHA-256: 4bab16acbeca0150cb0d1f83c561cc4485b9a5c9ac3ce3522f1c0b728ab05e0f

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