Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6a9c2184807e91…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 01:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d592f6cecdeebc8df091a278bf78fcf1 SHA-1: 125a54af548067ed48e7362e06a6d31d2712346f SHA-256: bd6a9c2184807e91b1a62d72c0f43fbf1d69a0fe63829b29a45225741c05f94a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://artstudiodesign.it/userfiles/files/fupujejulonimolojibivisiz.pdf In PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/wisusaseviderowobo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60c0b670f---bagebu.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/pemupagekosi.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210815_A837076CE0E73C03.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vapivanijarilajinebov.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/54669640086.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/57869692160.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/pikusafuritusom.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/ridazozaxufitoni.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5ad3bcd1---bupulesako.pdfIn PDF document text
    • http://asfalon.com/__files/file/71264784225.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15fec6aee---nefenodajomaxiwizaw.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c6c5fb77760a8b96c85448b0165d15cf/28525401237.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/37299973176.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/84018341970.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0f8ff953e856b6acf1a8fec178cc79dd/81624644643.pdfIn PDF document text
    • http://huntland.hu/upload/file/4592588656.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/feriguxasaboxiwosifupotoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+de+paralisis+facial+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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 18296 bytes
SHA-256: c95d93c508685c0a7a963de40f8019bf14ee14b7dfa48a785dacfae2d3d912c6
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10524 bytes
SHA-256: fb37c9bf8d74cf3ee2d8e88403df8b71cc1320eaaa9ebc66cfb13b4f36269924
font_02_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1