Malicious PDF — malware analysis report

Static analysis result for SHA-256 8158bbfce9681e82…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 20:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1234559aa3092754293377794961ad3e SHA-1: 1aacc789087967b60a9c632b766fd2ebc8cd8243 SHA-256: 8158bbfce9681e8257ec41b222fc8f6b5c62e1d83a1171762badb65d7ba5eb4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious content. The presence of multiple URLs pointing to compromised websites and disposable hosting, combined with the 'Password-protected archive handoff' heuristic, strongly suggests an attempt to trick users into downloading an encrypted payload. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious intent to deliver further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=final+fantasy+the+4+heroes+of+light+rom PDF link annotation
    • http://nghiencuuykhoa.com/uploads/userfiles/file/kupuxezusok.pdfIn PDF document text
    • http://emaaravm.net/upload/files/3033605598.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/81424179716.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210906_33690E84D8DFF134.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/87061611015.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/3617232392.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/37445555657.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/45312369445.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/vugojadefadaze.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/210ae871ebe66a70cde5b6e38f2cb15c/jaruputuruzorawanemid.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/11139580554.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/fisubovopedejerotuforep.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/26959239895.pdfIn PDF document text
    • http://apple888.vn/luutru/files/jetireka.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/kexanufobokabagotikagabak.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613863bb8ed5c---10038429767.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/56823960042.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/17024067631.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/rexuzokeketum.pdfIn PDF document text
    • https://stotex.rs/files/82000789821.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/978700932.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090203014280554.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4180ae784---vuwodomorobo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b2ca8ce0ba451a7a939fe742db153bbf/tevexalupotor.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/10634639317.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/33807316995.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_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 17648 bytes
SHA-256: f0cdd0af4fcb6d0fc70eb7bd2b5a321be008d0f0ce602fa4065441ec3d683114
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 10832 bytes
SHA-256: 112cf847e1e29f5055f6d726d07fc634c326031de8afd3df55219a466b38d870

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