Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a8cd1e8a36fee2…

MALICIOUS

PDF

94.2 KB Created: 2021-08-20 09:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 581ec8a270ef0e8424a4583bea57ad28 SHA-1: 023629ab7658994ce7868b48a63b9636e7d3924b SHA-256: 73a8cd1e8a36fee2a5889bad18908a159b599088991e101772a5da2527f29285
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://haidangpc.com/contents/files/wivosizina.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/2042451166.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/neraregajugafaxadufaf.pdf
    • http://danielbushreunion.com/clients/41596/File/40556458785.pdf
    • https://mavibusiness.it/file/75530681209.pdf
    • https://yodobashi-church.com/lidumufaboram.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/34100188227.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/9036793341.pdf
    • http://ustunongel.com/image/files/3795397826.pdf
    • http://strahovka66.ru/userfiles/file/9849981802.pdf
    • https://lescourailleurs.com/upload/editor/file/56462464480.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/328d076d8bc589a60c3f12cc510cd9bc/57023966222.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210619211405.pdf
    • https://abugfreemind.com/userfiles/file/sapawenigojem.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/voxotaxakoxiwiwam.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/193635aece16ebcfba87a88c90c547cb/pogevazezolalafurofifuraw.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kj1cm2pa7j8p1gboglp8p7n4en/komowumizejotowatufuka.pdf
    • http://circuitoinsulargc.com/documentos/file/kijojizorexovenujevezema.pdf
    • http://dermaktif.com/imgup/file/pogerutiwejojowule.pdf
    • http://guowangcable.com/d/files/lilabalunokalon.pdf
    • https://ludifrance.fr/userfiles/file/86772820057.pdf
    • http://mt-filtration.com/uploaded/file/170547322460f369c6d0224.pdf
    • http://galgalesh.com/userfiles/file/jepusiv.pdf
    • http://jhdjt.com/images/upload/File/84053580097.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=diablo+2+1.14+hd+mod+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bbb.bin
63a8f294120c05ef95b3b77d678209969125338931480c8487f65a906a8c0d14
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 17656 bytes
font_01_sfnt_off000139e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 16792 bytes
font_02_sfnt_off000151fc.bin
4037cd3345197bfff33b6767c682dc3e721e886fcb5248b00bc2a0d43f421404
pdf-font-stream PDF embedded font (sfnt) at offset 0x151FC 10556 bytes