Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfbc870eb63c97f…

MALICIOUS

PDF

156.0 KB Created: 2021-07-07 15:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0a801a75385b31e3d0dd9004fe59fdfe SHA-1: db544f2b0180f86f9a04f2f7c433e65a3013a234 SHA-256: 9cfbc870eb63c97fe3621d600fc3ba324d7c083237713c6aad6f23e4645e8921
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8731c288a---2335216156.pdf In PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/98a8cb0e699377e7656ec333c7595ea8/56540114931.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/80405933020.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/eb0b86cb51304ef0bea4a34ca0a50e0a/lomijej.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/bupibar.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/sifijigupipoli.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/42696366e3073092d6ea9aac5d9b4925/12408971616.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/77635271387.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/7752398759.pdfIn PDF document text
    • https://europartner2.pl/uploads/9275030058.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8f01973af923cb8e20d7fc7036249b49/degazid.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6c7e674bfba49e216adfbbebe1dad9e9/zepifilogiweradunotukebop.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/r8cpbtkqr5uar1lmh56ipp9ju7/pasuluwamo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0b97c40c730496719790792fd7f6c66e/gupevuwufusodarirojulejaz.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/9ff926900347096c408b4e1e97f10fb3/soweputetiziwusaj.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d967fb120e---beridirujililexokofe.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/f9iumom4rkb2q097fqpaevap82/sukuxenazadiv.pdfIn PDF document text
    • http://keacg.com/upload/files/gezarumegewapadavutiriger.pdfIn PDF document text
    • http://nensi.si/upload/file/nuwixizunaxebotufararemu.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/jakevokufubomedub.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c86726201---bejopinujex.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84eb128f5b---72258865927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dreamt+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EC1 10264 bytes
SHA-256: 00cb32f48c640643e27a2d9975755216c6d2836e7fd3c782415ed59d1f539858
font_02_sfnt_off000225c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225C0 2532 bytes
SHA-256: 230ebfdf73dd869aeaf2f32311120d7e6ceb7485965265fd42edf6878d8ce4a1
font_03_sfnt_off000230a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230A6 19728 bytes
SHA-256: 0a8b5d86df0b274acf2f0bbc57b03e5e056554452f1832db3722c19d47bd1eb6