Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bc5105c758ddad…

MALICIOUS

PDF

85.4 KB Created: 2021-08-14 13:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84a398ab6cad6383c84a43eb67a195ed SHA-1: a1e2ac5945476a808625c9f2ad8e92394b4e2332 SHA-256: e6bc5105c758ddad6577aea45cf368a5ed3b88577061dd6eef3173febc7ec654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=windows+batch+script+to+convert+xlsx+to+csv PDF link annotation
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7eb40736---89419342931.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/3822115454.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d3a49c18f---fuzugutidunudu.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62cf99143---kisobazekez.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c067a39e958---88316624724.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pasuzaxak.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/aaecf7f3ed7da27279f146207c980bc2/16724102148.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/petoxatubirakuluxopa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66d5321b7---lipowuvetegufepumexob.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/07d7c1546bdf6d240eadb33479ccf5dc/pegofotulebutirirepe.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/77956391322.pdfIn PDF document text
    • http://anm-av.de/uploads/files/kofotoxusenadimepijisese.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/86969635740.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/701166d2b027188ca17b24b7943c023d/74803471119.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mujavol.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/nokotadaruxunukikajajodow.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/98deb310bd78f7a71b615881fbf0fa06/lolovotekakolik.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9648570feb---vajemer.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/7442768408.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/pelafozofulesulamisa.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35740d2088---kigadir.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e594bbddae---rikiwakamotikomuju.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/84202753271.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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 11000 bytes
SHA-256: 511cfd8ecedf2c43692a7f557a02a872700dbde291e9e47c3dea6fad86d055ba
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 18196 bytes
SHA-256: 6f426fa778eaeaed6e19eea9b6d66b3d936107b4126cc9a1fc2b7c67467f4292

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