Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd58efb706c20f34…

MALICIOUS

PDF

79.4 KB Created: 2021-07-30 01:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c05d87b1b52f9f06b374740fbbee4fde SHA-1: 8dda742e67fd6b8372fb1b1cae214b5b341f5327 SHA-256: dd58efb706c20f3487ffc870eb28b62eec64eecbf2638c29065cbeb9c33d9951
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content, likely for phishing or malware distribution, rather than providing any legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://samsungklimalar.com/upload/ckfinder/files/roduxademi.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/l3m98k1p1ivmls4j7ag7tl684m/64444356601.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160882b8757173---bineguxuvipufeba.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xomosigewatirigu.pdfIn PDF document text
    • http://ippon.lv/uploads/File/diwapixinanevimanapaxi.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rukewavufidero.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/sosuzilupijijepa.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e5d428667---12928201379.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b86dce3c07884f5d641f79ee9e314fa3/nuseg.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/410a11c6a29f263abc7558f72bc6153b/20827770581.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce87429b5d4---tijobodovizazukusogaz.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/bonolot.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/48jto8ba8iq2alnokur0vrj9vv/91804988653.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39895eef35---fazadulinu.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/49023479346.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/luviwirenemafavi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2ade2c8f---xuregux.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6920ebd3b3---28474296358.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/40455017844.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c595b64d01c---namopov.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082abc910789---robuj.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/jodizurogadirofez.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1356247d61ae8c584586c22fa0273ad0/daxizizesoxefopo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160867a9b566f2---xofiwisufufadikuxovuwuseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=zambian+grade+8+mathematics+textbook+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_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 16280 bytes
SHA-256: 7504fad87392b1093d87327226bb93853847645de7c9d4f13d02f9b75ffd82c1
font_02_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 11528 bytes
SHA-256: 490bad5f8c041a7d4ca2c4b52d2d7b418329812abf9082669f3015b05c643faa