Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa850327dd82f533…

MALICIOUS

PDF

198.4 KB Created: 2021-06-05 17:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 55c4ab00441e1472b3f485382c831343 SHA-1: 8b5dc492a97dc1c95f69183e2b25eba515ba491b SHA-256: aa850327dd82f5331d17e3f875850370fa5a121aaae4fa74f51edbc94a44ad6f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The document's content, combined with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggests a phishing or malware distribution scheme. The presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://queure.ru/uplcv?utm_term=g+46+certificate+of+fitness+practice+test PDF link annotation
    • http://diplomat2014.ru/ckfinder/userfiles/files/34475292557.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce302cc330---biregiwuvibogusujox.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ce4a61be---89086077355.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f68440c99---jovepefatimarolote.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/13ef3c99a7e89c034cb5c28b3d55d672/62392373932.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843f21506c---nemekafavezatukaliwasumo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc8d9e508---91737193973.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/21023991458.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sqmc1q2bafl7cih664ljhn7405/bezogavipikakuvopefed.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cdf8ab056b590f65fe08de3845542fb1/lulejiletozulimafijuvo.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/18268920708.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a69490dfafea080682cffea5644cb4be/fimakapawefim.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/lusexaxogenojavixaga.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s2blsria7tg3dp7vncjgh55vpl/96838456252.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a093113f---1826359485.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12fahu7g73nlkeiejg8o8s37m2/sekekewikevujeferir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D42F 5252 bytes
SHA-256: 466d79f9f047d5a44c0c7b2c118ba0e5723c321fe221183e546c80be046fd7a6
font_01_sfnt_off0002e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E627 11024 bytes
SHA-256: d7014f8cc200f4bc48864438c498fb1aee951e3dc5ba00fcc09b2f4f8be24b83