Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd4c6b287dd6d70…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 09:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c822482ba3dede68541c0aa5b0a69c5a SHA-1: 9781bd61d063b3459196c3aa690abd33dceb91bb SHA-256: 3cd4c6b287dd6d70d4ae7dbc235cbeee10a56e6969dd3e21d44fee9bb2599312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of numerous links on disposable hosting suggests an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.polni.si/Images/files/norudedabidomun.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74951175189.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/96367044727.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/46478823919.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/bea0b4a8083d484d7c95469d62f6dbfb/dujusosenumusemapiseb.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/pajilodikekeje.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/ritatesudamaxakeganife.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/796a60e6b2709fb497306b2cc24d7d1a/96299629308.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/weluvonasiwuj.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/liwaxoteminugexi.pdfIn PDF document text
    • https://hsse.cl/files/33827020435.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/15752450149.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109021658101834.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/90419822653.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/pafuvuja.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7baa0334---tujisilager.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/44679667491.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/61219145108.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/04f2214e9ab7b04e84d88a2a78763e35/babisaputitezunutedetal.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/33056766120.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/jotojixaxixino.pdfIn PDF document text
    • https://photojet.net/userfiles/file/33121577099.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/64972538022.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tekaw.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/duzipelatidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=french+teacher+malaysiaPDF link annotation
    • https://mediaget.com/userfiles/files/18252126907.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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 16848 bytes
SHA-256: 39e8934457ce9dc35b233615ff801267ecc6b411b4ebbe03a5d6bb93f895ac1b
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 10464 bytes
SHA-256: c90384d4b59bf7115ba4ce2a4bd7dc0060e9ba3e759077ee759d0168f71b95c0
font_02_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1