Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8cc436e403a169…

MALICIOUS

PDF

88.1 KB Created: 2021-10-24 13:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-06
MD5: 21491014e83d219e675ba58011325ade SHA-1: a33c67e97eccc6d716d6f453013eda9bd725d053 SHA-256: aa8cc436e403a1692d125ba4aa77bcc02670f44cbab571d8e279e3a1942fee80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=brook+word+meaning PDF link annotation
    • http://www.ih-consultant.com/ckfinder/userfiles/files/99285124720.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/jivopupedubodamapejol.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/joriwolenibefod.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/vakanusagirigatu.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/18505091044.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/fupomovewebavonanada.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xavukepa.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/54215f6f5e282ffebdad7d26cd1aa6f3/subebadugixaj.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/lavaladivumatoretezafeli.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/99965774294.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/36181590458.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/xusirupobinupufibegivir.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210906080604167.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/xafawovololazed.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/luzixam.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/mipodomuditumozi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8n0pil2t1j10gmub2e4cf8e2e4/xirepulazef.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/10941300639.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3dea0b9b---runebadazewirogalebetusem.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/tawak.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/82949208695.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/josapipopaxulovetimoxexu.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_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 18288 bytes
SHA-256: 8290859c48866d7038581f143543fc3d5e1675d326f4f2e0b2f1a94f417aaf10
font_01_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 10512 bytes
SHA-256: de6aa530e92252e1ebf2fc40d3f6a4ffff086a970654c3bedcf93dc9945e8df9
font_02_sfnt_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1