Malicious PDF — malware analysis report

Static analysis result for SHA-256 9710c30d86052d72…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 19:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3bf1076df0b3006e3b44b4e6bd4917f4 SHA-1: 76d136bd3e18e16bce710f78f116988e16083955 SHA-256: 9710c30d86052d725a1059bcbfd09ea7c7b01326fa5ef3fa42dcb26e31884bb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://viveironativodevicosa.com.br/ckfinder/userfiles/files/59826534255.pdf In PDF document text
    • http://aisef.org/uploads/userfiles/file/file/jifotu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/tekizusasafimapurefum.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff41b12789---24117312315.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/damatefimako.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/parexadeweli.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/tunoxamuwaminanam.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/nopefepewipip.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e5fb84717071256af1f452cf8bb31097/11474331516.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/wesewo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dnpa7dlt6g0kkhnan2thia190v/waberaga.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d2ee6985d417e0f1b4f27b96afb2ee87/99358945026.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075742c5a62c---jexujoj.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/dopujokobavamugatobiwixu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/j4r8c06bk1shhihvfem10e68k2/wakujozepilokanike.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/kixekemupowuwejerula.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bd02b90db23b880ba04acfc55bc54ca3/wuwufuvuwa.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0001e7de0303fdf70597702fc9d76e1a/74585528633.pdfIn PDF document text
    • http://myphamasia.net/upload/files/tutubuvorejupisebevebu.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/82573544756.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/fojavanunegobuzevawodij.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/gijadudineruwim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=confocal+microscopy+pdf+downloadPDF 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_off0000b441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 16760 bytes
SHA-256: 68c34aa2b1f894d76f96b78697a316a3f0c94489809ba01c9be0cefe49ac60ef
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 10780 bytes
SHA-256: df78906bdc773027eb6634eb81cbd66330c55bbd83222989e965bc899739b8b7