Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db6d9839ac19baa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 08:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 173e6f1fc3476aab69d68dde8f9c4e62 SHA-1: 0cdf6c6a7b7cc7d21b75c85de66a8763bf491ef4 SHA-256: 9db6d9839ac19baaebfbcfc7b87bd709d0283a5ba7895c96658bb943aaf92eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=gurry+on+breach+of+confidence+pdf PDF link annotation
    • https://fobh.net/userfiles/files/21812824214.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/84rt0ghajqhudr5e1rvt87t566/xolosofuf.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/98155448984.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/91770852131.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c5e5bcafe4aaf8c13eeb0a12efbcc002/87395593137.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e67ffea9b01---17609701194.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/fetikilib.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/vekezoregimunu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/54dff4458e28d3ef9f96331d9e0af131/28261574710.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/kewasomefeloforodox.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e9e21f3b13984c83be6541dc6eb81af7/nosevixubokap.pdfIn PDF document text
    • http://santeh.md/img/files/73722143983.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ac6c9d82---gumixagujedelovekew.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/37260637055.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/migogewatoxidu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9d88eafb3daf3f9967edc92e4b89fc6a/jalage.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/42885979665.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/20213582926.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/86052903478.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/80049209158.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/20891953415.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/birol.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0396fd896d---befebexoxafexarezixiruk.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/35134565983.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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10796 bytes
SHA-256: c1b57c42e39b772c235f51d7f0378b83420405fb8c7ba0f43e4091b751bbec0f
font_02_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 19852 bytes
SHA-256: be105a16c20059894353848851e96ffe5f9c162d18849eb66514e3efe2666c16