Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9688c4ff8cfb87a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 23:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6ff557a3effd4f556ffb826d6f57f5a SHA-1: c582b4021bc20564683c6a194802f9c5b930d1c1 SHA-256: d9688c4ff8cfb87a79ac0da3190abf7bb5d0bd8e0395a6e3ffb701e170662de9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of websites. Several heuristics indicate that these URLs are part of a link farm, with some hosted on compromised CMS platforms and others on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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://drafthe.ru/uplcv?utm_term=how+to+stop+advertisement+in+my+mobile PDF link annotation
    • http://gewidor-gmbh.de/uploads/files/77759605891.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/sovexo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2cf8fv2q53c483qm3f1ehduhms/70192075265.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/xogijekefovesupoko.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/xisokopasa.pdfIn PDF document text
    • https://ancoraeducacion.com/images/21027847054.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/zujam.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/rutibava.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e9a9d6ac940c3367289a9b4f165e604/29979817544.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6f8be61557f5870a03e47bf72a689c83/femawixababinimup.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/julikeborokepilifat.pdfIn PDF document text
    • https://goodline.by/userfiles/file/30412097533.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/govovuduxuk.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/jemonugivubunizu.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/sipiwigugofa.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nejirinetivesodoj.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/xubufafilosedis.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/27434264479.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210902011453.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kozojamiwaxa.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wixelo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7bb16a84---57161310238.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 18256 bytes
SHA-256: c2b6de679eb8180ad74f93bcc0b5ba9265ebf6377214582c80af0194a283708d
font_01_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 10948 bytes
SHA-256: 0f53864a198369ef809cb9f37164a2955615276d346c9f1c019c28f762bd15d1