Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7d506954998f4e…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 19:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: adcfa974eebe44b6cbc8743efefc5c2f SHA-1: 65835edd5b8f04f00840c5504da202925858a1c1 SHA-256: 4b7d506954998f4ec33e51467a7ff4550c28b5e586439f8b4efeea259cbfc909
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document acting as a link farm, directing users to potentially compromised or malicious websites. The presence of external URIs and link farms suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wastran.ru/uplcv?utm_term=interview+of+a+celebrity+questions+and+answers PDF link annotation
    • https://firesystem.ro/imagini_ws/29460131602.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/zigafaviz.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/68727217430.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/jesosokusemagixuxenif.pdfIn PDF document text
    • https://kapefashion.com/files/files/77852524949.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vadajewudepifesozux.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/dobofadokamopijowivufeme.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3977723715.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/tijumipebak.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/rutenogopalin.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144db5d3756f---vitidudamiramijuk.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614327cb9e194---57926251338.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/9510072718.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/jixowe.pdfIn PDF document text
    • http://bdsductri.com/upload/files/53253509743.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/109815396.pdfIn PDF document text
    • https://davnosti.ru/upload/62405198533.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/73280543441.pdfIn PDF document text
    • http://lj-group.cn/upload/files/nexuram.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/59592966196.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/zabefuwetefetisawizatufum.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bobafimotijudisog.pdfIn PDF document text
    • https://betsin.org/userfiles/files/zinanazif.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/mijit.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/aac97af9dfc98ef6919ed501cad0ddbc/51567462782.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/kafupesimuwiruruw.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/ninumefovudunujanosiz.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/41328880304.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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 15704 bytes
SHA-256: 7ca3c06bccc236c228568f547af7e993ff2df0da6138c9b62ca16d9ccf7b603f
font_02_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 11072 bytes
SHA-256: 39db939743554bf905386289125c736b96f8f8aafb6ff5c712ab7fe0a399215b