Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d7a3ec0e4ca1b2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 20:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4facace2e5d56482458212f0b92f1f39 SHA-1: fd3819c3ae20d325f3a873d72610b29546f19855 SHA-256: 37d7a3ec0e4ca1b2f394eff2fd7b7985cb7385d0a69a98699a8bc37a74b4756e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, likely to facilitate phishing or download further malware. The presence of embedded JavaScript and the redirection to external sites strongly suggest an intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1444942175613932f1d40f0.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/aa3caad6060011eac6b6b2d2b8b951c0/32754767959.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/dupitamowadefupo.pdfIn PDF document text
    • http://trieuduong.com/images/Download/52389855449.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe96a87411---zabopelulikagava.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bk7bbnh23qe5osnfc5qomlndk7/zaxot.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/lidewetopikixuluwefovazal.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/desineronabopuv.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/12163583410.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/wozofibivirojenekitemesip.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/60817948177.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/zasefaruwadaxa.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/64350788641.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/34898853593.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/26351165990.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090500564673499.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/52681417742.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kojupemi.pdfIn PDF document text
    • http://apex-architect.ru/images/file/wenibomojomujadux.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/49785292688.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7e06960b391c5753b03d8a6ff5804573/72995702650.pdfIn PDF document text
    • https://cakkue.com/contents/files/rediwubitat.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/juxagatugifigarove.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/42484259328.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/ruroxonodufaparokajej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=react+android+app+tutorialPDF 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_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 10484 bytes
SHA-256: 7539f30b843aca3034bcc967e6d36acc983c56c61507f37f9fac85ab905b605d
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 18488 bytes
SHA-256: 40a1598a3c8b0594b52efc2fedd89416977c77b2cc943a0d35f96b6f05fd15b4

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