Malicious PDF — malware analysis report

Static analysis result for SHA-256 8562530126f9ecd0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 17:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2931d8215ea09e10e91a89ab618e7346 SHA-1: 839dab54cb9cf1525ce208b095a5e7241e4dc1cd SHA-256: 8562530126f9ecd016f8d49bef30d503397006ab9c9e21e732f4f655b84702c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised upload directories, indicative of a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kompaspt1.com/contents//files/manigozovototunugewu.pdf In PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/63046803881.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903205626997996.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/31943873877.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/gimoxuwese.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zesowasinilajulugujowa.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16075c51bc920b---vigogazasotinizo.pdfIn PDF document text
    • http://tencanpowder.com/d/files/41272524561.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/71340432407.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/30338219388.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/wonupabazoreluzafewotiw.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/47e88bad73f1346353672d36d0cf3c1b/duponoderakugonapidipe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f0204db0---18888894982.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/35528718822.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/83316487531.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/d020pe2t4kudlnd1s5lipeqh5u/38157166855.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/porezutumenasikigu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b83b6b190a385ce2a2353dc9bfb3900e/fuxelofunudoz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4b8r877h4sfebmtogj5s70gj7f/9651269163.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/8317076868.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/48263924497.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/46334460422.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/rutexujibinujuxapukuv.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4fea03d0---26388611819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=postnatal+complications+pdfPDF 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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10548 bytes
SHA-256: 0ef1e6f805218e3c7115c45ba6f64e0eb4cfcbb5429f430428cd01b1f70ad3e3
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 18048 bytes
SHA-256: 7214353b81c3b2995ecc45cc260e230799651b7c34b130702a3c694faec7cb69