Malicious PDF — malware analysis report

Static analysis result for SHA-256 097457d7f706d35f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 01:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cf34bf90f92220af681b36b5bcf9dc1 SHA-1: d259f647e3a2a507cb055cd2d4d3d33f19b52877 SHA-256: 097457d7f706d35f96cbfe4e1918961b45d0b0c0b73cc74641259a2bebc9497c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://support-cmu.com/filedata/file/80114498738.pdf In PDF document text
    • http://rts-3.ru/upload/files/pejuboderasiwa.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/36547999373.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlu0k3mie9cjfupcin0ecj0fni/80529079936.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/dedur.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109060500161797.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/58189285356.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78daafbb4---bivujibumuzugesapujule.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/koditu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/wewewazareja.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/debebokegupakorezepegew.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/sademon.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/2477158891.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305860bb874---73602987619.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614217f7d7ea0---44978622684.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/buvokibimura.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lasogitizagolagebufiwigef.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/62726518364.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/78085431793.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/jizonixebobabinadiwaf.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/doxikafaxidelodefinipeter.pdfIn PDF document text
    • http://benrassam.com/uploads/files/53626759694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cheat+code+sims+freeplay+androidPDF 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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 17620 bytes
SHA-256: ca17cea6894e1258fa0d85f0c65da74157cb390178e15783231ee3ec751b78aa
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 11028 bytes
SHA-256: 93636b758d01423b3ddf98a0de3b252fa2190b25a530295b3ea960e463a8f998