Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c2f77d9c1e8545…

MALICIOUS

PDF

69.6 KB Created: 2021-10-07 19:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f54e1df467977f934f0b3114dad45074 SHA-1: a4d98fe9d7430627460cdee7339161f55acd3479 SHA-256: 81c2f77d9c1e85455c94aa696c6c4906153f42501f1c6352624568d73e4aa173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple unknown URLs hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9a73dc45---faluvojejudewopakajisopax.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/85121259943.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o3t67634rrvfutf51ch82hp2kh/2742123901.pdfIn PDF document text
    • http://contua.org/userfiles/file/zusidifegevimefol.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///xepowof.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/51880631592.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/joluluzemipolikoduribiwir.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wavabebevugo.pdfIn PDF document text
    • http://strandedtattoo.net/file/74673987803.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c64c329add---7936958517.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/vexoxilodepitajopajise.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/zibitaza.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/47470421470.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/47203379498.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/83626550305.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/bipakomudubilewe.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/defegezeberare.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nj1lenu0q6gsis13u1dqbaomq0/37008136489.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/kuvamizarufasefivo.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/savanepofosijolorurite.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/winajevoge.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/kibubowobofedaburitoxafa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a08d941ff8---96616888233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+dies+pdf+stand+forPDF 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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 15180 bytes
SHA-256: 53f369cbe8b7823df732497b2893e6fd5bfa0e1c1ce896f796791a034c6c9f71
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 10540 bytes
SHA-256: d641c753d9a8cf71e8db91b6bc52a1acfa495e552c38aebba4154672d3133191
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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