Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6ed2f1846bd8e8…

MALICIOUS

PDF

88.6 KB Created: 2021-09-08 15:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: effc01dc2de1b032bfe633bcecea8474 SHA-1: de9ca392be81b4ce47f2f0b746c1b9cd4fe6149a SHA-256: 6c6ed2f1846bd8e8baf56ee2bc2569f1de437e564949223bf1c2834ebe646d14
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF containing embedded JavaScript and a link farm. The link farm points to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://congtrinhnhaviet.vn/upload/files/dijijanugumusipezeravob.pdf In PDF document text
    • http://pro-customer.de/userfiles/file/sovakiziwepo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/79685606780.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/50138162268.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/nudigeni.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/pisimubojifujejiju.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631087642.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/81170003216.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/wuzasuwenivoleberirenur.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649fab8b03---76781213440.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vopekifabedo.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/76535084227.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/tudekoludenamajubederegit.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/relevoxelefiwotogu.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/zimifatitavow.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0951445f5---pinekarex.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/67158042800.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd588b752---68499299005.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/36321756433.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/vidijoxalum.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/81eddcdca4f50232d5bbff9a50ba75ae/47861418114.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/jirip.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133de44d40dc---pibasaropuralofa.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/67185760609.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/85173364851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=simple+past+tense+pdf+national+geographicPDF 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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 11140 bytes
SHA-256: 054b8cf50d9784a6db945d5b2cc4eca6ae56a6008169741ab538ed11ea23d0f6
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 20288 bytes
SHA-256: 164fa12923bc177ec529506d4fdc3c099b750ae0296ad807a5f6ee76b6e34aac

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