Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73c750e36a5a060…

MALICIOUS

PDF

115.1 KB Created: 2021-09-07 02:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f905b494bfdabaf7bd3742b5ecb47f29 SHA-1: 5618a59e34fbc3d8268e18350efd144f3731cc9f SHA-256: c73c750e36a5a060dd08a2dca3baeb3092bb67595503f5431084641ca29efba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ckrestaurantgroup.com/ckfinder/userfiles/files/72666824539.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dgepu19qddbjh9aub9khn7jnt4/15630290144.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/3642255265.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f860e5bda5ece771f211f91c251e889c/babova.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xegavevutidopegiwiku.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad13eedff6---70132433766.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ee8d41a40---masetopobafapez.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762dc8ae18d---limilotu.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081304464617.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/m5nk1225u0uq818jj9jq1cp388/nulidune.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gj9jmg9i94qcmjp0begafv2prp/talidelerawufogifagoxot.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/45fdb721b7c9180ce90df3234fc50850/fenesurixavagupi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb614d068f2---rifedijafapuxawuzigiw.pdfIn PDF document text
    • http://esejsc.com/upload/files/89085727264.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0ad76caf---lobeluve.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7d2ff7df087a0057aec83e3bbe3f825d/juwiwab.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/48561247560a8cae847971.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/df1c238e010eeecc7c483695e7376449/tuwobufenixigux.pdfIn PDF document text
    • http://retailcop.ca/files/wizunuguwinemukije.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/kuloxevu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vevalejadolekofe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e3950687c---pimidasevolixidetapivix.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/73197546276.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cmgfurff486cpa72b42o6h7d71/30295321097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sejarah+agama+kristen+protestan+di+indonesia+pdfPDF 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_off000160f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F7 11196 bytes
SHA-256: 86b17be8a005f2fa8d081d7767cc90d3fa70700fafa4a642fdd7e03aa283c0a6
font_01_sfnt_off00017ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000192d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D3 16808 bytes
SHA-256: 8f9f72efb1e4f36dfca176d1b1965c760fcb904f8f5a67880256afc1cd67b923