Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf7c291e82ddb4d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 04:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 518f0d2b32f5b9eb7446588d89823e93 SHA-1: 49c0fb3365b3d4017a5ec4cf196a27b2667bd6ef SHA-256: caf7c291e82ddb4d141df9351a6c70940b1283dbb480a8ee5402e542599e10cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://longbienco.com/js/ckfinder/userfiles/files/56551793942.pdf In PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/7918166438.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3da161e7e---retonipep.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/27c0cdda440be8e32c7e91469e78f1b9/jojijinofujeg.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/wolero.pdfIn PDF document text
    • https://petala.gr/userfiles/file/fijizubax.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jivogakajowanale.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacc694df2---73702250571.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/18333938540.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061910590773499.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/45700371674.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/23716833463.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/nezegatulafejokobosa.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/165760f9b245b38d7945adafde60e72c/46332473501.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/39492339717.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b20a0e68e---javawuneki.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vitowuretebimifokozerula.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/38711463997.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea92932346---taniruvoduwufexor.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2f54d5f02251dfc1cfee7bc68a402255/85742780610.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mfk8vdvvl9er0d5c6ai08bogef/64905706858.pdfIn PDF document text
    • https://micsys.in/userfiles/file/lelizotinuzavova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cbse+class+8+civics+chapter+1+worksheetPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11044 bytes
SHA-256: e636c000c7930bd546809fabd614baf8774c6e5845ee2f729bea1ad37e657b86
font_02_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 17576 bytes
SHA-256: 24dfd3b3d473dcdc82d365e2e6353741042f2ce93dd70d0f782b0c5ca6596a10

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