Malicious PDF — malware analysis report

Static analysis result for SHA-256 da59ec54456d172b…

MALICIOUS

PDF

88.0 KB Created: 2021-07-09 07:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c00c7a5080228b7fc9e4ae6338bc5ae9 SHA-1: b1dc1ba3d77a134b0f36cf4e4173dc941d0ac1ee SHA-256: da59ec54456d172ba6b59593238616f73b185c178ab51eb5940b33b6bfcfdef6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the true destination and potentially exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://brandnewgoods.net/userfiles/file/57276817449.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-18/20210518121128192908.pdf
    • https://dianthusindustrial.com/resimler/files/49129745083.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0783ef24a43ce9caa85f993234a782bb/pagakukukajanelux.pdf
    • https://agentcctv.com/userfiles/file/6386840226.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/93ce1245258803290ec939a2b48df293/jeseg.pdf
    • http://banlinhkienlaptop.com/userfiles/file/puxawizutukevufexusovavup.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qdaquja4oj7hj0rt4b0fmu5oa5/25127794990.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lo5nrlub97klcnvct27onmj6vd/zureraku.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033888d2f2---kewefedurur.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/zurifobivimuxemuj.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r473rdg84hcdnv883612g7j61k/21898765155.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/acfc01be0a4b90714f85513cd947a864/24788779357.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607788bed2133---6619935313.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec004aa8cb---10962912028.pdf
    • http://valeneighbors.com/userimages/38021395273.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdd623810---39377731417.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc083b5e8---xozobenasuk.pdf
    • http://ehomeforeclosure.org/images/file/jezenalokonumego.pdf
    • https://soudurelauziere.com/upload/editor/file/95107395310.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a5a892c6cac98022641abdcbea9f8172/lagipidimosoti.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db00d9c4b---51228581413.pdf
    • http://inwallendorf.de/userfiles/file/salexoboxa.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1dc5e911---49301951863.pdf
    • https://cowichanseniors.ca/userfiles/file/41071378048.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/r4laa8bb4avmadghsjlr0npqsi/fugadudupapiravo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=higher+secondary+plus+one+result+2019
    • 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_off0000f347.bin
cccd8aaad4e9a8e94194dc868f55e19f8a14e250942c9eb49c35b9c0fa90f3d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16968 bytes
font_01_sfnt_off00011f91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 16792 bytes
font_02_sfnt_off000137a8.bin
c9f5696b464522d09ace1bb1d285514baefbe305a48740903eaf0e9e90f2bb59
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A8 11460 bytes