Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c836fc19dde739…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 14:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96c3cd43be71a823e5469ebde6289f71 SHA-1: b31653c5e4aa261d4c764c0cdeee10593c4595d3 SHA-256: 33c836fc19dde739a98f89d2753d684b95c88dc919ad841e54b5f6aa62fabcde
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed here, further supports the malicious intent of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://greenlivinggarden.com/htdocs/UserFiles/file/xunoxuxefedurowopas.pdf In PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_C5FBE6EE657FDF56.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/1868113665.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/r045act25crn5a4rsje5kil704/gupumigezifa.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/80640348895.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/36183287644.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/ruxosaginutasobexu.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/51299563212.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/zigus.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613ce421b3676.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sitajujaxaxexereze.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4a3c8ca70ad8708819e07de5b65337c2/jizitijojeraxijudila.pdfIn PDF document text
    • http://lovesenergy.nl/file/relexewobejibevigugofigu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f8ra58bls01hrh3raak4tt35qi/jebalititone.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/54377964735.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/13038173672.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/xibit.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/joritazonavefek.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/romulasafavaguv.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/re10him2okep8lnoru6u7peds5/77383714428.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/12900623336.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/bidolaxiveledupubavo.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/26272296072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+download+live+cricket+tv+appPDF 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_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 17572 bytes
SHA-256: 276bd773688cc48485ecb32843409d8d573ef8bc93846d88c5e426326e35076c
font_02_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 10560 bytes
SHA-256: 3cc7256b80fe322114899bb3c69bd75a88a25c76bd2036dcef4c5b5a70bf0ab1

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