Malicious PDF — malware analysis report

Static analysis result for SHA-256 701ea5c817f3aef3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 18:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5d934c555ce53ebf3742f7b34c96667 SHA-1: 900956b9bb5de31c404205058c58426ad14911ca SHA-256: 701ea5c817f3aef383d5066cae2a77f914b6b86944d698143549d422f9a5d5b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malicious intent behind these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=where+are+bug+reports+stored+android PDF link annotation
    • http://asijskepotraviny.cz/files/file/54259896825.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff00e87af---9587763796.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/fapufogat.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/jesubemasasugonajefitibi.pdfIn PDF document text
    • http://stefani.cz/fck/file/dafegapefugogimikedi.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xedudovejituwume.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/fimuvomexafitunefi.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/76137611001.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/9817267139.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/58245099792.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/juretedatalaxapoxafofifed.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/tiwipujafelox.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c0d667dd---99971585061.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/23242835967.pdfIn PDF document text
    • https://dptech.vn/uploads/files/26573975959.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/46737179737.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/85552485545.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/16571892706.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/36b8b7695f21e740c79f6d6889f8d931/vozoliwuxevabufodozutaju.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/zunogefenigeweti.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/kevidatezutesorejizexuri.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/gubipisesimaxobega.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/33748043752.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 17640 bytes
SHA-256: 8cce577484f3059b81830f12a8ee3956d3f67b9343ddb2d4e8d6cb9f824521ca
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 10856 bytes
SHA-256: 16736958e58dbb959b977fb106f3a487564196e690c14a4a3667ae51ee0586e0