Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9325fd8cf3688ee…

MALICIOUS

PDF

83.2 KB Created: 2021-10-08 02:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c1dce4804b3fec00ab06b714084b6150 SHA-1: 365f94025d8d63540621d01fc6b071b1816bcc2e SHA-256: a9325fd8cf3688ee431c8cc15e27ba16f7d719bbb5d88580e829651ce52b95a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=meaning+of+philippine+national+anthem PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7168ddff9caacc9d0e7efff32652d576/kidorosetukofodig.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/juxajawujutige.pdfIn PDF document text
    • http://korytnica.net/data/files/47544484316.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/50778824224.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/3864327346.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/88143262324.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/potisibafaf.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/3866119389.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/mawanuxiwetexur.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee85ed2e0---25632181290.pdfIn PDF document text
    • http://moristas.com/userfiles/files/7951226957.pdfIn PDF document text
    • https://theipbuzz.com/images/file/4912313811.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20211002192551.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615688533fc49---sulakilinaxu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/47bd43631cef1f0fcb109abe6294f455/lafusegejesexi.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/47818507259.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/papesipafegapo.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/zenegiwosew.pdfIn PDF document text
    • https://efnnma.org/files/file/46922978634.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/zikitisibovumibikudigus.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/lanekoku.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/40926158911.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/88831065414.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/65376505327.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10528 bytes
SHA-256: 2f0d298a41bbf06f6675f1e91cc090c84c0b00db0ba7e2d9dde2f115fa982a33
font_02_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 19188 bytes
SHA-256: cbeaf360a3c8d91200286855059181571e033f90d43bac8b901a71f8617ce9ff