Malicious PDF — malware analysis report

Static analysis result for SHA-256 7422a0b0e33e9a1d…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 00:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ec36926c27e20e1bbd0a418bd7a1e99 SHA-1: 50ad39d643270aabbe519ddf21640481f4d1deb5 SHA-256: 7422a0b0e33e9a1d5c1a91b79812391f7065df17374199e624da2dc575533185
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to compromised websites, suggesting a link farm designed to host or redirect to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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://oniceh.ru/uplcv?utm_term=editor+pdf+para+ubuntu+16.04 PDF link annotation
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607056ed23a9b---tagaxezubobuvalivuzozefim.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf218abb02f---tasejuf.pdfIn PDF document text
    • https://emmaushuis.org/pages/98576269285.pdfIn PDF document text
    • http://hifi-markt.org/kunden/kronhardt/ckfinder/userfiles/files/nasotuzagulilanebed.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a52ace93007---lifuxu.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/buzunafusuxezug.pdfIn PDF document text
    • https://almavilag.hu/files/files/93398667189.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/zotuz.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06da959bc---fumadodasirutasekewe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c450ac137eb---fidukexebu.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/gonijelukakatuwojefod.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/zokezojobirimewexujitela.pdfIn PDF document text
    • http://1carl.com/userfiles/file/69902812339.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/37972465096.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/10893174767.pdfIn PDF document text
    • http://faradbox.pl/files/file/vufekuvawera.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/64339486556.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/36852906870.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/xuwupumosapavisugutijovos.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/60793238999.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c86cc188c67---99927850040.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/88634015246.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/43596932225.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/87ddc7ec74a4dbe8791606e89d9df26b/bipaxisanomemigu.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/dakopibuf.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_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10852 bytes
SHA-256: aa72663c5e1f1a056a005ffc3cd8c996d3995f48185dbcfd0ec76c82dc8b105d
font_01_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 20252 bytes
SHA-256: 6896bf2c1d8c7dfd64c63749c21c5d5739820d72f3d8601bb7159703fc0220d3

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