Malicious PDF — malware analysis report

Static analysis result for SHA-256 f343ee48288f8a9d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 14:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8b302d88dc9faaf32d184a7b27ce10f SHA-1: c3c1648abac5c845649b452d0761f7d26820d578 SHA-256: f343ee48288f8a9d43e9b99ed682c6e99c3ff391ddfe8eca8dcc90c336691731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fc70a8b5---tajuvewimab.pdf In PDF document text
    • https://banghenails.com/upload/file/84670156179.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/2846830832.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/3825894717.pdfIn PDF document text
    • https://yellowstonewildlife.com/pifavuxixu.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/gotawutugeje.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d31f07fd0---96026762641.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/5913300387.pdfIn PDF document text
    • http://brlairport.com/images/file/dewifofevolavaretofesu.pdfIn PDF document text
    • http://envigest.cz/upload/file/28911684402.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c6e6ims775q7b2l7ogia877og0/zujuwumikafawuv.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/46d5b2684b02a025efa99ff270287723/gofuzudarisoji.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/43938192105.pdfIn PDF document text
    • http://woykoff.hu/upload/file/38651077828.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/43162046952.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8afdb6d3e9---38846234553.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/87578486066.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lonali.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/66438290378.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/56952043824.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338c7fbf308---62105190471.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759597e264e---konetofezawonexajosukimi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1f6504c2---28840746102.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/78720510015.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0ct1h7o2t39glflmd7r8rfm4he/natepuzelazesupifelage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dewalt+multi+tacker+stapler+manualPDF 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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 10692 bytes
SHA-256: d7425e07e8b631ee9fec246e171931bba27f75703c6b3b616b86a00c9718f5f3
font_01_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 19300 bytes
SHA-256: 4f25235cdf3e516c9337b727676c02daa104dd8a599bc8fe64f67957bfc098a6
font_02_sfnt_off000136b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1