Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc04a95d1c91c62a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 03:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbdfdb6dbcc2b9b87f06fe29f6afe7df SHA-1: 207e89fb7a47cc90ad10143a44e1df47c54b0b58 SHA-256: dc04a95d1c91c62af196deda6fd201d757dbb321542464680f646a88c4ed5034
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses time-sensitive language to prompt user interaction. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 https://archism.ru/uplcv?utm_term=wake+up+and+smell+the PDF link annotation
    • http://ccspatti.org/userfiles/file/82735315686.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/dedobefiletivituxo.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/9668817369.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/mowobawej.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca59af5fbbff56fe8b73c441eaebf58b/bibumukitixopufusakubul.pdfIn PDF document text
    • http://kunbot.com/upload/files/71561710614.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nefujofoviluru.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vepusujananur.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac507faa3f1---misabimonunatoxegu.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/purusogudusukudi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160911afb9cd41---segez.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/vodelale.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/rokixanu.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/50962455524.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094495170e45---27263411862.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210530090920.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/tadopowuloj.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/7818711532.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/72288154454.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccc8d2189---tapimosusosakujasifaroxa.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/katasaburawumabafitiba.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k0n5k47uripi2dh0v013saslh4/97036419556.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gaduvevomivinu.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_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 10528 bytes
SHA-256: 9aed2c77e43b79777539bae091091b1d59209f7e9eb10dacea547b52201e234d
font_01_sfnt_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 17548 bytes
SHA-256: d85326ffe3039a815ac2710de8c76ffd3345ed7b47194938e2beaf153bdce6cc
font_02_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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