Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffc2b3e8a3e8c3b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 22:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: feea35e653ea2cd3888035d261513534 SHA-1: e396907ec36ff9b3608d272f3824be1b7347214b SHA-256: 8ffc2b3e8a3e8c3b51072487552a275b5404340482be37f0354e2cb5027b2225
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a1a4982b4b23b7bfacc6546ae6240b09/2520000189.pdf In PDF document text
    • https://tectrongim.com/uploads/file/sudomorisina.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/77101282651.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/pemexevixofejaxorixebi.pdfIn PDF document text
    • http://goldia.cz/data/file/wetegevonimifamija.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/bebudone.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/94483304687.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wezapepuwitezonud.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/jodukiwibemol.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/lupusufefetejusane.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2815a7efb361825eed62f257132987c8/gevus.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/ratufodiliwejek.pdfIn PDF document text
    • http://1carl.com/userfiles/file/tebik.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/48125550169.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/92166112616.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/sukofalelulisumo.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/90259856023.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/tilunoxagedibide.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1516fa91---5100664987.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/17789504616.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569873dcc2---40539656365.pdfIn PDF document text
    • http://suurelepa.ee/data/file/wizibaliru.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wemunupovuxutan.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/20619895209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+corel+draw+x7+for+androidPDF 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_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 20636 bytes
SHA-256: 65cfb064172e18f8d3526aa8705a69876cf411c769c7243795666b21287adf87
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10444 bytes
SHA-256: f019544c1a314e9b483dfe51c584be8cf1fedfcab767892bd8a3f1903cb161b5
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1