Malicious PDF — malware analysis report

Static analysis result for SHA-256 865a0e4806be59f0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 11:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09bd64d88e0ffce296a197c4b00b5bf8 SHA-1: 77782cdeb2e94a66aced5a4381d53874c8141d50 SHA-256: 865a0e4806be59f0406d6c9e552fcd905c082e877b33b96428cb2e1bdf6c627f
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 redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://laptopplus.be/app/webroot/files/userfiles/files/rekidabixodejo.pdf In PDF document text
    • http://teamtrinity.net/trinitya/file/35446358867.pdfIn PDF document text
    • http://homeopathyhk.com/files/kegalegekezupi.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/vepezalo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/bea0b4a8083d484d7c95469d62f6dbfb/dujusosenumusemapiseb.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109012024389078.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fulasekefodig.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/eafqhd3mnoa3ef766e8rkgg9gg/44078301586.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/18219556202.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/97232908245.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/fuzejafoladigo.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/teroxibalisisebitadon.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210903122240170749m5e0xx6j38ho.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/xakukujakedamarata.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/lexiwenetoxa.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/26487442931.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/14947359912.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/moxekasowu.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/bonanewagiruvawovolitew.pdfIn PDF document text
    • http://cssh.es/img/file/77446226667.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/momozowobeletaneriguze.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/89322402200.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/ruzewijobasopujagarafuguk.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/95240481781.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354cc86bae0---59460896401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=car+cheat+gta+v+pcPDF 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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 17284 bytes
SHA-256: 42843bbf41102a8dad55cb8108f468b5b7fb939d184f3fb9dbadc7778a2a7420
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 10220 bytes
SHA-256: 78e1fdcfd73a5d9957e4e1d9c01645ef3363bf98fc4d9e99f10082c84db24e63
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1