Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4afb14c12ad89ac…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 05:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c2b1e212f5d896aaacd4f93cdfe98b7 SHA-1: 607285447bef262dc48fa16477535c9b080ed897 SHA-256: a4afb14c12ad89ac6260096d0ba927c432b94efcb34cf0a1209e2adc65649281
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The URLs suggest a phishing or malware distribution lure, potentially disguised as a game download, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=dream+league+soccer+2019+unlimited+create+player PDF link annotation
    • http://talleresjpg.es/img/file/jamuvafofuj.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/48019968985.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/todigu.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/15299028373.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/18330859392.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/ruratenetaduj.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/fofix.pdfIn PDF document text
    • http://slovoveri.org/userfiles/tabonitosezaxufolowuga.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/75544021339.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613df81cce692---8977118394.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a8513e024adfcca16f206c0ca2a78ae7/dagajuweb.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/9850634038.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/gilidadadobanadereroki.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109021407561474.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/32636341751.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210909_0D190F21826686BE.pdfIn PDF document text
    • https://network-italia.it/file/11159708303.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/kemagugakiguginasuzoj.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f879535d1cacd744ce46038ea3495dcb/74851421283.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/lowujapikidefoxezogesafiv.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/taforusonovavegu.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/65713137732.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_off0000b602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 17104 bytes
SHA-256: 4c0d14ac34045bc96d75e7e9b1107af1260c011c2befe17f48746a8567d4a4fa
font_02_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 11532 bytes
SHA-256: 9075af1f30439fb172d96f0035668e43c0a1737912e9bc98d41a3318d4b6ed0c

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