Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8994b0e11377362…

MALICIOUS

PDF

80.1 KB Created: 2021-09-26 20:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7d3bce3325f952100cbac32183bd122 SHA-1: c58061eb26cffb8891f7c4f0e98a17ed511d7986 SHA-256: f8994b0e113773628f256bec6842dce998423910765cb9284fbde75730bed626
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=aja+mexico+chaliye+karan+aujla PDF link annotation
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/75054156323.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/lobenawonunezuferavujabe.pdfIn PDF document text
    • http://pololanna.com/user_img/files/21057146783.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/1968916919.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85f819e02---lomumil.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/45105113627.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca45f4ec0f---xamop.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/11542703469.pdfIn PDF document text
    • http://a-pluset.com/userfiles/81990331924.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/laveta.pdfIn PDF document text
    • http://cichanski.com/Upload/file/33134760294.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/67680791117.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kobegix.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/071cde49d18cf2a284a224e31820bd80/44021873033.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/3368320962.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/13056957960.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/kiwegevet.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a0b1ee302e9e0125f1ef47a446e93ad7/gigejetipetidija.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/31662942209.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/99679446253.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/91908132696.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b83c50dcd5a2f635c8ff430b35fe71a4/pumemibifatosu.pdfIn PDF document text
    • http://ahaadesign-com-tw.sales-frontier.com/ckfinder/userfiles/files/kirogotidixiwesimosele.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/53279732938.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_off0000b79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79A 10748 bytes
SHA-256: eb2cd536b6aaf7f56099ceed5ec399000b4beb20a64ef0c1ca7a5fcbb20e8a8a
font_01_sfnt_off0000d015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 20280 bytes
SHA-256: 3daf250b6de98213913ca93d69838b3d299069e1c972881402d613d63d8ef5d7
font_02_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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