Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f39e58393c6491…

MALICIOUS

PDF

100.2 KB Created: 2021-06-30 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3f88cb8af360e03de97cb2991b5e5059 SHA-1: 30dda336f825032100f2d3dc63afa576e9cce855 SHA-256: 14f39e58393c6491ee1b6334664d9f80a771b0bf3b7d824470ab2a1aecd57efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thunderstar.cn/userfiles/file/20210505212124184897109.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a3d3a9db195a3ddfda3dc3d47cb5ed4b/66606773877.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e3d0bf96---39087169006.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90c91109d---23317452245.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/gogimodisiruruvemizo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/n08lfvs7p4atoh38a5utkkuvu6/gavimumududoxa.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/97993778223.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f116c83c867fdd7f20019e679d55d755/venidujagaja.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609d234ea655d---56416927362.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca86619e3d---68715117059.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a8dbf02092199ab1c57b575091799665/65239808128.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a45161352---33021053156.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/zofukolirob.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/37661705143.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/wafim.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abaebd715f3---2873876604.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dabc9b51f375c9dfd827b7eb3d006da3/vonofilonefarixazawanigi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/toxapiledama.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/pebunafixolagupitim.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/46709375952.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dba4e82f78754138a5c91269d48eefa3/86114470437.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/829e3558035d415e2027d60d9d5c521b/wogotezuduvom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=illuminated+meaning+in+bengaliPDF 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_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001371f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 20956 bytes
SHA-256: d36bcf43e9cf666093103361c2f99592d10968e7581dd81ac1a410369908b412
font_02_sfnt_off00016cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD5 10396 bytes
SHA-256: 9b1a44d21018428732e061eac4206fb0c42d87929ca7b1b7f194aa685fd08720

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