Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efe2a5e4f66a936…

MALICIOUS

PDF

90.9 KB Created: 2021-07-30 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc61d7a078bdce704b926195bddfb215 SHA-1: 66c6b9c1cd5be8080924dd5572c293a56f5e639c SHA-256: 4efe2a5e4f66a936e8da0dfb462bff96dcde28c8668dd61c1e0068cd2a555f8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, likely intended to redirect users to malicious content. The presence of multiple unknown URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b0a6aae3---91263078366.pdf In PDF document text
    • http://melinterior.ru/userfiles/files/47317790733.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757cbc7dc7d---2617646538.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rgqr018hdnq0afc65aco9uggm0/32834278974.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c04980f92---22146706948.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2911ee3f44---59035108447.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///84643331115.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094538fe10b0---vowuraganinixadizolefami.pdfIn PDF document text
    • http://fedoro.ru/upload/file/76847101098.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/vutanolikuwafavovudofibob.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/webuwibamulazuketotu.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/27592877052.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160785244b68c6---13228596930.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/mufisaxizutemi.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/baxaf.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2d97ba81524fa93e61691d225977752d/78572392237.pdfIn PDF document text
    • http://zerosquareonline.com/file/23999909879.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a825138ef44---21811506300.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/fozugazavop.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/68518643400.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/55424418806.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3k97p1clb93d801kkns057gihh/87960848249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cookie+clicker+cheat+codes+androidPDF 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_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 19292 bytes
SHA-256: 568e8075f1accd184b8257580537b6f714c485e1fb78398852c61665e18a37e0
font_01_sfnt_off00012d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14552 10592 bytes
SHA-256: 73625df7c1c37905f637ec0c581934cac31df2fe4bbbec7ebd78398aba823979

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