Malicious PDF — malware analysis report

Static analysis result for SHA-256 234793a3d2d59800…

MALICIOUS

PDF

78.0 KB Created: 2021-08-09 01:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f5574909ef9064cee12010cd251cdbab SHA-1: a90318d98e597576f35f7684d4c76122e3c2a995 SHA-256: 234793a3d2d5980091a242850566b6580a455501979b96a1e4b4506be9fedd71
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=planeacion+lainitas+tercer+grado+bloque+5+gratis PDF link annotation
    • http://hatowo.com/app/webroot/uploads/files/57946977058.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/filukakuvinigodazuva.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/29042284757.pdfIn PDF document text
    • https://proxus.nl/file/81354565553.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/balotinudamedija.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/37821197698.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/zuxupek.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/peviz.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57976f54---ripijamajorepisirutesovav.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/20573662335.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c87c5db6723729b20b22a2694cae9c85/kagoxepagoxeto.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a5e0d7a24---10251192464.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/03e6qrea6mgvd6oin5giosudl4/mizevigo.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160869f6580ab8---61390267498.pdfIn PDF document text
    • http://huntland.hu/upload/file/6042679155.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3b9rbl7peqvfus094uoo3ecch3/94763479835.pdfIn PDF document text
    • http://saydersan.com/firma/files/fukupamup.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/77d4168ab933988a380719c253bdcfee/zevovom.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/89836667916.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608093cd58d0b---64528370639.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xikirojise.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/20269899070.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160720a83a1f59---rotip.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 17936 bytes
SHA-256: c825c1f5a899370a1afd5df72c92f7e7b4102a1a351eef2c28f403c56de95fb1
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 11064 bytes
SHA-256: 8ba5c760a0884e7e69025c8be36bf7f49298e757b6db5e6efe9c915c0e2f4f8c
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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