Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c18a60bf14b7c7a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 07:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f4f7384dcae0ceb174ab7e36daa37cb SHA-1: e22c5ca2bd549c995ca711537fff6bf2fade9068 SHA-256: 4c18a60bf14b7c7a7194b13bad787c671e38b79f570d030df3ff95a3bb705790
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 http://bonfiremadigan.com/uploads/fckeditor/file/wojivul.pdf In PDF document text
    • https://burlingame.com/wysiwygfiles/file/70117810171.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/33457753056.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/37625378429.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/82825179847.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/32142715528.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/95655711101.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/mekekumikifugapil.pdfIn PDF document text
    • http://charivne.info/images/file/75777681133.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133a52546347---69175547780.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/25393616899.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fcb365f133c811fda32dbeee62b3ccc1/fafefavapiwogepesixu.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/gefuzijavegikijum.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/89976346665.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea690c7bd9---19910829877.pdfIn PDF document text
    • http://wenxuezj.com/images/File/29899442785.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/59940968411.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/56139941679.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/66187032766.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/woxipaxevapupoduwajone.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/xuzuzam.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/77589623883.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/98383300517.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/36341035666.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b6740826243bf07fc34c6950f47486f6/81375010630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=war+thunder+esp+2021PDF 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_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10620 bytes
SHA-256: f3a8cb17746154877b961b59b93d67ca88285a4f01dc5ca5a3df53b3a60d28af
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 18268 bytes
SHA-256: c54098d4262f521277d87600b83af97f45391505e942d4de65f65c179b80fe7c
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1