Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd23ee24e5d6e96…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 13:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 494ae335f90323e0c7746a17855caf8c SHA-1: 2ee7ba21c621a9c846185c346a701f12f3b5dcd3 SHA-256: ebd23ee24e5d6e96b5e9b65a7804bc6bee794841f740ec8bee6c7fb76d4d91da
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. Heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to various domains, some of which appear to be hosted on compromised CMS uploads. This suggests the PDF is intended to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://importfoodfair.com/userfiles/image/2021/09/file/zepubofaba.pdf In PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/42196843828.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/maxuvuliratejogata.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/soxosamofage.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210909103347.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/pikeledekagakabik.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/92268887972.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a468aac9619064676bb4f3492a34a02/25842533761.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2ffac1a8---miret.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/527060986.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/43854523448.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/jiwogukiwubok.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1298718395a6d7d2a449d19ffa608db9/vuvijusuxilezefi.pdfIn PDF document text
    • http://ranchobg.com/img/file/sosawuruxipezilekuzovug.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/pogorewun.pdfIn PDF document text
    • http://ternovykh.ru/content/file/17519196049.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/kifazoredawivetukinenumel.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/87407984554.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/fotijapetizinedoz.pdfIn PDF document text
    • http://consade.com/userfiles/file/wedexilepuso.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/86296584532.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/tibibetufem.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c85d44e5---25801826687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dragons+wild+skies+gamePDF 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_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 10672 bytes
SHA-256: c28e602f623c0f84d232232c0af30d4655fff88880c58155a8bab5017973f099
font_01_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 18220 bytes
SHA-256: 3fa29d7396c3aa1fbe8869d0e6fb9eb3b40c23a0127b60eddce581b21baac9e1
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1