Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c987062a3b035d…

MALICIOUS

PDF

86.3 KB Created: 2021-07-06 04:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dd68664e50c580e8887b17623071d483 SHA-1: 4b013db2ab0e6332c84e35792d8c18593db3ba49 SHA-256: d4c987062a3b035d1e1c2dfe5f9f4acccc3ad09a2f590e7ba6e2fc198efa75b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=what+is+the+scientific+name+of+watermelon PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160830877586d5---37974374426.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/3cb30e2d584b94406620d3af5d50fad4/seduridinojasin.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/59707882347.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dee2e0f16676d5eaf1cc49f0eb05a710/rufofuzurufuwubu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4b0cfe28156fed5c6a7502107cd06f52/16850857200.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f9eb98375---24345179434.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/23806944620.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a9930cbbe3c93f6096289bd69cb98e4d/47390815337.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79ad0dfb6---bovojixugol.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af04ce5ab---89629671593.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/93485623649.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/45b0ff.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/fifezizalidezeja.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/sulewubepireveloku.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2308637da6---92603704153.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d02d389a---45825130129.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/kabixaw.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/3317912037.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/toxupudamosafokenajudata.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06e60a6441d66e8602aeceb61d84c8ed/puzopesalegajala.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l7l9mjgt040ih6eshlktgq94h2/57988434664.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/64097262451.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/11421349796.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/mivufusitos.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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 17400 bytes
SHA-256: 9bfb7e9bf5f0040b2f08c011af1e4d0a9c0cc435a1f8d1f9ff798e6997b83716
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 10680 bytes
SHA-256: df6561bf559215ce381d7dece633cc58ecbc1e8f66cfb24aae856c0935a4fe46

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