Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6f7a151eb993c2…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 04:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3158295c7378fbabb06fbbb05feb75fb SHA-1: aaf2d3d47154693d1d8f3198b64369ff571fb7e2 SHA-256: db6f7a151eb993c250070ce179993b627a1a97d8236c163902b2d06853c74b15
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and a high ML score indicate malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d155c791---zitugovunowo.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af94c2c4dd8---widajegixiwivakuvalimijon.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/22765gjaetr4l6bkbd336pehjv/wikebefakuwizuwojo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16084853e5b3b7---gisikopub.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f2c72623---55481726187.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe4204e6c4---15171853756.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/28073715376.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4095218563.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h0d0a5rit3i8n1bngdilmlrl44/31098027902.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/14318257407.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/37491727905.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/17c3c2bfe1499b5b02643a89c6d5680e/xebebotunub.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/vejemimul.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/28625093275.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58758cd38---53439201375.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ebed42e2254a649b0695bece1b442be4/jogifepuselafiwib.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36a671edc---funategeguvibixudovode.pdfIn PDF document text
    • http://metallpress.ru/files/pozolatepogame.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/suwasapokodelolopur.pdfIn PDF document text
    • https://dhesient.com/media/kakilexiwulefuda.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/39b36d9ba83753ed211dc4be54de6578/tosotavavoxareserisit.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/52979483392.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d676bdcd---terolujujawotokobokut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+three+stages+of+aerobic+respirationPDF link annotation
    • https://mediaget.com/userfiles/files/83273440601.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_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10816 bytes
SHA-256: cb29335d45347041be1dd1423f0e3dfa3794d28e7030ac4d475b17fee3011dd3
font_01_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 18272 bytes
SHA-256: a4ef6021eba7decb92fd1c1c8858df1e39a42e25f85e01349ccab76c36281f3d
font_02_sfnt_off0001553d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1