Malicious PDF — malware analysis report

Static analysis result for SHA-256 301c4ca80ab0df1a…

MALICIOUS

PDF

77.5 KB Created: 2021-06-29 07:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43f007c2eec2cf5aa41c81918d88d603 SHA-1: e37a01158dba33a4ac2040b0e6cfa9bdbb90fa15 SHA-256: 301c4ca80ab0df1a6781ccaa55bf8db63174ae78f8961d65681915869bff0d36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the detected threat align with a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=dr+sloan+and+dr+shepherd PDF link annotation
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/fdafbc399af33e57b2b1396afc106088/sotedisusomef.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f01bdc013---47686549677.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/44824916785.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8fdndln8arr87q04pdfu948vip/15982720426.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5dd2a113f39cf9996b841bc31c66da3b/ronolezuxowukosigaz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/454dcd091e87f7f6993f3f965a2f04db/zigafefuxawanu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/145d0f0a2997f6c99985362938a3bc52/muzopumifito.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/jedisuvedikemogenazilas.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00ab7be40---65925151062.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/60748439086.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb28d5768b---9319116299.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8cb2eea5369396cccc39461024cae37f/56165584172.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/60499362996.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fezisinafudinelusun.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768a81528f4---litulorera.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4dbc4d3a---14366669582.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/040aa36bce984910aa9e2b29ae8c1373/wuwakoxebijafijej.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a0e78aef---poxipuxuvuzelud.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/fokilugos.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b66b6bc8---83943358952.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vajibitenumamalukone.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074d369cc945---kafotomopelapetopi.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/sotoli.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2f49ecf3e5c8618e272e5c9b57aeb931/rozanul.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_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 16764 bytes
SHA-256: 39186fefb25f46956da855b92f0a04092c2a3cf7d8022fc0b68ac075933ac02c
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 10300 bytes
SHA-256: e0fbe0d3cf41f1e53076c290beee40b3c0ae14854d46f96cb885a3c1fa6b43b2
font_02_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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