Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a05a0ea282e9a8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 16:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e73c448dc93dc06a7aa63617f2fa3da SHA-1: a88818720b828e1e777cbf3cfc3d34f2add7870d SHA-256: c6a05a0ea282e9a8a932c32a0f3d0dc1cf801d8c59c1042f9ade13728510d483
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' in a URL suggest a phishing or scam attempt to trick users into downloading malware. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://pistant.ru/uplcv?utm_term=download+bbm+mod PDF link annotation
    • https://securitydm.eu/slicice/file/wubarebabowenero.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/46128591233.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/9660930615.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/xutupiwirafagademazopud.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/fakidafaxudi.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/gobot.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/71466670878.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/51022689117.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210902125105.pdfIn PDF document text
    • http://15881588.com/ckupload/files/roludati.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/gogixigatedesere.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/25217058179.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b4757048c1b37e092d2a82b0a4b3c863/98979404488.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/15360281121.pdfIn PDF document text
    • http://ccadl.com/files/20210913234348.pdfIn PDF document text
    • http://bastola.org/userfiles/file/josevoselemixazi.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/2683419838.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/26747874562.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcbc6dbf1---xefuwumurage.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/86189620004.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/4376933372.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161413ac6587cb---96521754374.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/melotuzovefim.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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 10044 bytes
SHA-256: f663dbb776dc763207e4420efdc14a74113b7ef635c2f95455fe3878b2fecec3
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 17288 bytes
SHA-256: 515df72ab7b94e274cda95eb49dad34bdef1da931a16f8732a24c2d0d3e34848
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 1828 bytes
SHA-256: c33f298211ce3313c3b5548322e33fe4bad710378db3bc89ecabf7a7149131f5
font_03_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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