Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e34e2ac4a32f3a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 20:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb3ef8105c6ddc7a134c0edea9cf39cb SHA-1: 0baf939a47e6273da20f02158b377a1c34b1eac0 SHA-256: 55e34e2ac4a32f3a6c747d584301f86867b08d31de4b2ed2ea1a68826f06f7eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a remote-support tool lure and ML classification, indicating malicious intent. The document likely exploits a vulnerability to execute code, leading to the download or execution of a secondary payload, as suggested by the numerous embedded URLs pointing to potentially compromised sites. The presence of PDF-specific heuristics and the ClamAV detection further support its classification as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://sunriseinnjasper.com/nbloom/fckuploads/file/22162655716.pdf In PDF document text
    • http://makinsushi.com/uploads/files/rufovavexekitulitajezozir.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/76538954351.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zimulujitojoku.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/vovavotazanukukozo.pdfIn PDF document text
    • http://apex-architect.ru/images/file/moburo.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/17888583257.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17a3a2905---60097607664.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jilemum.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/60752201275.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/vofopofumen.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/negoboz.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/daguvujivame.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143208dc1490---71985305720.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/14641956799.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8i9rtna75qfh9mmfhk45b2ki95/maxitorumagozobegoz.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/51158933588.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109112020235016.pdfIn PDF document text
    • https://lorus.rs/files/xubid.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tatosato.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/gupetoseratagitonam.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/25635076795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gps+not+working+android+autoPDF 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16988 bytes
SHA-256: 0bd25df03b70254ab66d201390cf2e3297ef227ed27d864f944f5fb2e132c119
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 10708 bytes
SHA-256: 154342d553e00372ba54b22a5835290e330ef6f02a3abb9e1affc6c5babedacc

Open this report in the interactive analyzer, or submit your own file for analysis.