Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c9e8f5390c4517…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 22:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d306d24f01842028dcd94e7a855653b SHA-1: 5410c4dcdc03741e5e88b74121388420ce053471 SHA-256: 88c9e8f5390c4517a99383e11afc0cff2fae63846b9d56cc9051875aeaa5d2c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=marketing+objectives+and+strategies+pdf PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b045990483e---34309214266.pdfIn PDF document text
    • http://rjt1.org/upload/files/9710751991.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914b72df335---pajogekovura.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/97471657697.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/figukebuzeditunilesekuv.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/kaxuravisi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6841eaf740f7324e3e775a8577829205/rijazojikofixelekijo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7fadefd8a---sisexonobitodamakex.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/91087947983.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/55019396310.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/pedin.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b941e5481d9---rularojixakajezulanetetuw.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108261812172687.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/beb5866ad67773525efe6a7fc5919dd9/zoxunizixerifekonopuzenaz.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zipowifagik.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/91787254980.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/vinixipadexokagejog.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087159c4340d---fumuxobo.pdfIn PDF document text
    • http://chinalabware.ru/d/files/3301689563.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/diwivadisolopexizimatuge.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088795abbbce---57289938679.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1c4fd6068a13f2b7a6565eeeff8a39fd/lotoredu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6b7043d929feba4e50c9ea7642c38857/ronire.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/70741754861.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/63635357543.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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 15928 bytes
SHA-256: 26985d6b3a2fd8ac331e5d093b188a9dc3a28c5b37411b23f42c4a3556e2491f
font_02_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 11172 bytes
SHA-256: 3eae65c99a7ed55a89fb5063f22ab9933f4c76f3448a74897931960c7448c9fc

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