Malicious PDF — malware analysis report

Static analysis result for SHA-256 2083e1b4cebd7e78…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 21:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb3f764b7b5823cad8e95ed8047da3a9 SHA-1: dd8d6988793662d70c1a89e8fb5d2d2f9cf265e6 SHA-256: 2083e1b4cebd7e783221f2302587979c29f4c471b5738377c38c70c4cfe55140
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as malicious by ML classifiers and ClamAV. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded JavaScript likely facilitates the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=a+time+to+talk+by+robert+frost+theme PDF link annotation
    • http://www.bash.cl/media/file/74033823697.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/76286043748.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vesiwelagepixogameg.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/guxuxininoxudotakinosokok.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/mivivor.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xufibakupug.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091022273052.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/vopikeverofakad.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff7e7a941---banuxeke.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/77986827373.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/47513252140.pdfIn PDF document text
    • https://argumentua.com/i/file/15684112881.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/97155750351.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5ea51457---7956424215.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/mazixefizogurolimuxuxon.pdfIn PDF document text
    • http://acelybio.com/upload/files/wudonu.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36183827140.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/35152862126.pdfIn PDF document text
    • https://angkalaris.com/contents/files/jerukazubawijadaluf.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130fb72ce05e---49669450739.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/guxareloxonuvomeba.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3e49gacn5cvktq8naagmck0sf5/7273871443.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/80903874792.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/wewimaku.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_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 10700 bytes
SHA-256: 51064222039f26143bba65170b784396bad76a7099dd92fad88dceae19180edd
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 17892 bytes
SHA-256: 9e41e3397f12f4c57eaafc886c5ce39204bf867230766e8ef00ccbf8648ba8b8
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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