Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4225e15ed34a0d4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 17:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e4989faf64c4ee6f638cc48f7ff57aa SHA-1: 6e84426fb38f0a72930228f3292ca51474ecf336 SHA-256: c4225e15ed34a0d43a54aa280d87bae5b8e133f19c32ccc85afb6008efc7e6fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, including WordPress installations, which host further malicious PDF files. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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 http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc914b68e---71051076538.pdf In PDF document text
    • http://seosanhrd.com/userfiles/file/pezabefijepemevifunelu.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/wonazon.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/weruze.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613138cb5ef78---vizoke.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/78598333228.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c450021e5de2252c89dc92780de6315d/dirozipiwamodumif.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/ruletagov.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ef8ef03f---ledonopeguxirexe.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92367368843.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84828482944.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/67208855035.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210905122652.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/59989379760.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4a927ad811d64d75a2fa6623f84b4301/41394167678.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/nusufidalilunusowari.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pizisekinokulopuriguli.pdfIn PDF document text
    • http://stylekd.ru/files/vunezelexipadarilakak.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/vesurutalog.pdfIn PDF document text
    • http://kunbot.com/upload/files/milifefevakebatatawofivuk.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/baretememelokuz.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/xikemozibejunolela.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/70429505030.pdfIn PDF document text
    • https://hirurgija.me/files/zuwudugofovoruta.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/97705679283.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b8f4ff31---30175898384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=taldor+the+first+empire+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_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 18280 bytes
SHA-256: 7b486941ebd2870ea730ab341ea7523b735cc70814a792391d4626df828defe5
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10624 bytes
SHA-256: 5042fcb4651bd6c4414a2eef22ede8c206c2a8c4e7106500fb1b309dcfd6be4e