Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51a600a1f9079bc…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 07:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c14dece2bdaca5f1776068cc8a67518 SHA-1: f6db674fc92f63b01b30d0d709c6870f9082446b SHA-256: c51a600a1f9079bc20c85f1cbc741fa1349974f45a4f40db4d190ae731928966
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. One URI points directly to an IP address, which is a common tactic for obfuscating malicious destinations. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913924290d2---42398497754.pdf In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/de2536fd5ff3a01a61530fd1f62bbccb/rogopoj.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abe73f1b21f---91984124828.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11fab6324---12654736122.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/kukuzitirone.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jd3sqb8s29bl0f4j1eb7i3g2jj/vobaloka.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/11754979429.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/riweni.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/15643263729.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e71c1b05d4---lapoxe.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/nudapuwalirigugudevesixot.pdfPDF link annotation
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/3c7d93da9e54ab7ada0ef460e5018503/76364696935.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/1228486011.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m4sk84ro1vf09fcto5hhp1h4q6/99925736965.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/zireseg.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pokupudiwapezaxasakobo.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/rumuborakare.pdfIn PDF document text
    • https://www.stavbyhes.cz/ckfinder/userfiles/files/85769789325.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/bosenizak.pdfIn PDF document text
    • http://storemisr.com/uploads/files/87136816447.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdf900a43---sovipamojuri.pdfIn PDF document text
    • https://giustofiori.it/file/fukogobobowapikemagizulod.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/65778057728.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9fff7ef77db99b1111862bb05c796026/70260150785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=summertime+piano+jazz+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_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 10808 bytes
SHA-256: b9aa97783c659978063894d659e6e129814a71ed069e5d53af12a56e1944241d
font_01_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17580 bytes
SHA-256: 8ffd442e523892ea39f6a735175864ee44ac354c3045a77a78d9aa3db54f5867

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