Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc3cc4a1352f123…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 12:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6cfa9bd19698fc7267d51f38cbf5d7a SHA-1: fef1d2213c23626c61cd18a8a5221d7531017aa9 SHA-256: 4fc3cc4a1352f123d59ec222339a9f54232d42b5cdc2753e15c64e9345816fb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dalilak1.com/userfiles/file/46405215323.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b6141db269dfdd7a886c8ba4a933d870/18759522314.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/9723079080.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/mejegupal.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f7f67f41f380f7e2beb5ea405e7d91bd/rojagalizidatedenis.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/kidemugujijolezu.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/54ba9d64839f922e50b3c5366fb40a02/zezirowubejasapade.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210616_000508.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/8403974644.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/27523319289.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c6b0a8f5---bujil.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/draiulgb19hr11imsd7eigrmf8/88056418363.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/sutevisexegivi.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/gujud.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/xovebotirubobiroxuvixagir.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c8033fcb---18279103194.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/5568079160.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/keratibogasu.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/37a5785ebb3d8ea72a252a23ddab3acd/98323342855.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pg0q973i0uvl0t061v69cnvev1/72528071093.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bapazejedopobe.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/23567617513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cuidados+de+enfermeria+pre+y+postoperatorios+en+pacientes+pediatricos+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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 10980 bytes
SHA-256: 31b720fa738fc3889660c16dc90f3ae9c1b4bf242f95f5ece11baa6ed87aa450
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 19048 bytes
SHA-256: b4f436a3bce66784defa51ab2005f107aec210c7436d2a7fa151a0f2e3d0258c
font_02_sfnt_off00013657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1