Malicious PDF — malware analysis report

Static analysis result for SHA-256 8367309fca2b7f1a…

MALICIOUS

PDF

113.4 KB Created: 2021-06-11 22:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 794b0b093a65a674efa1c4ee5c56075d SHA-1: 696412787171ebd04fc0eb5fe329d8b910bd3de1 SHA-256: 8367309fca2b7f1a2b55363fc3e69bf7b2b0716603671f0a9446fa1b31de410a
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=bus+ticket+reservation+system+project+in+java+pdf PDF link annotation
    • http://pressvaluation.net/userfiles/file/25305663091.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rawim.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d24ca33f11afef4f8d24b0b6ccd3ef1b/retirirebakinulubalesozi.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/memapinagidowegudefob.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/lodobigonolilolet.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/95033318830.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/36c97b4a8faa693f01827c8a349592d1/89267003818.pdfIn PDF document text
    • https://ijpdua.com/contents//files/87494019695.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f9c4322dd4204c18abb37e73cce17c2e/xituzuzikufome.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/24164654867.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769bdc355ed---xexomitizelorogegeza.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/t41hofrcn0cgv0mqs0cs6161j0/zonoraripaxukitidid.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/zuzomifike.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/varofafovanuxetilimif.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/jokegene.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2775a7b6---movunejetofuwenupame.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk22e31gopvov92epa70bmajq9/rubupemale.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/52193029985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C9E 5620 bytes
SHA-256: 15807a598c800e2975eece36bbf2ec965dd8604d228c2d9777b471cd771b6aa3
font_01_sfnt_off00018fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC5 11748 bytes
SHA-256: 349c8e8af4dcd5242d85d5bfff5817b8b2c20a7012dc2b29bdb97fb23f2450b6