Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bb02644a5530a6…

MALICIOUS

PDF

95.3 KB Created: 2021-07-02 04:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 627e3e90d01d93a8c73e5772681b038a SHA-1: 6672f39b277ae54a0672b7269abf70b76e54bf5d SHA-256: 78bb02644a5530a64f6f19e235ae3b2328a78ad43eb91cb79c5d50b4926c8d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://batikatravels.com/userfiles/file/tepifonow.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/so3tl2c375tshtdgeos9rre8m3/ligoziv.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/77454303753.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817d96add45---tuzajuvoxozojamobu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c784cdb4ccc874c311b3a912b9339630/faxurofuxefujujavemi.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/maxukagixabujabu.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/62214773615.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e227e4c8---16993490111.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/45e973062ee38e6c3e77a221bd961efd/nubasezoro.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3n9pvi5q4ncp7amgf484055bct/rujinatokotezaxunowitexi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/gazafe.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/7c0ada93948060dc921cd5f585bf14c1/lumol.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/famikowawidima.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b16785292---lebonox.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815c561e8b---40089044089.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/tuzibakamoramesevuwo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d03f0825559---fibogeladinamim.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846ec07fbd7---riwafowezugob.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/903cd269d982fc601af970eb989c9886/kojugi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609c690cd616e---tesuvotet.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/dubuxe.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nu26deohp4bjv21010u71ieen6/xopariseduvokorowusoxaji.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/29982555667.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/34b9c5adfac74fcd917ee86a8a38349f/tawol.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/mabidenoro.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/16131512028.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce28c6e16---jemavawebedefijotaposaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=give+one+example+of+thermal+decomposition+reactionPDF 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_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 17624 bytes
SHA-256: 7668601eccfd260e67ca6d4fe65e418b6d07f5ec2ec8c599103de3a4a5e1afab
font_01_sfnt_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 11092 bytes
SHA-256: 44ac9280256de7c55aa36073fa0e9a621570439bec59afda04b2528fa02f0b2b
font_02_sfnt_off00015719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1