Malicious PDF — malware analysis report

Static analysis result for SHA-256 accb680961615b87…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 10:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbba5421cfac12493b40b6866e25d8fa SHA-1: 0fdd1bad3ff7e4f13491a1cf582628bced0d59ae SHA-256: accb680961615b87398da50ffdf6d47e81ee52e2abe9bbfe371199f005d4ef2b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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://dammesliepas.lv/ckfinder/userfiles/files/ketosimikubem.pdf In PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/76962170962.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/zerono.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/71998547266.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/sedemezukutewomoni.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/xaxuzin.pdfIn PDF document text
    • https://vientangluc.com/upload/files/51104549506.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/89419563396.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/vinedepapoxaribukopinatan.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e06821c4---damilidodosokumodib.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gafagoporu.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/luwuduwufoverogexov.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/11536962166.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/katogen.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3fdf9f7efa05dc8d29700ad9716e4715/44046116414.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-17/20210917233152283319.pdfIn PDF document text
    • http://erictex.com/ufiles/files/63084334935.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/6335115724.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/19236997090.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca286733a---kivusafomofawezazaguz.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/25722585760.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/pipipedud.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813011a3f7---sumupodezowapogiledosapo.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sobotulijoxavezogi.pdfIn PDF document text
    • http://slsnn.ru/content/file/vuvunanowiduvak.pdfIn PDF document text
    • https://istanajp.net/contents/files/38913043115.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/reber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=termination+acceptance+letter+by+employeePDF 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_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 17484 bytes
SHA-256: 941bd2b37587e9d1bdd96c0fef5dff015cf21497604a49bbe012c3dfa6b9a20b
font_01_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 10584 bytes
SHA-256: 9a65c5dddbb0f2f94e03338d80864ce45ca0e513699554de5c812d9b8d439761
font_02_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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