Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d4466eb3f33830…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 21:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 041c1e91bcda668dee0c4ce3bc89ab04 SHA-1: a23409192d849b7790c65f93c5e43e47dfe6f3ad SHA-256: d7d4466eb3f3383082150b66c1d4834707eff2ddadfbc8460e69b408dbd08f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The presence of ClamAV detection and ML flagging strongly suggests malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.singchai.co.th/ckfinder/userfiles/files/nokozudupizolituxi.pdf In PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/38222049971.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/baxelutefujijupok.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xajogegorirenexewow.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb71acf9---wesedokazofitopi.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/62170703887.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/suxasixosenapeliwanirop.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd35d9baab---55372900500.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97590714138.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/mubujezoxesefirukesig.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/zijisudefezalujagevaluxaz.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/12359846841.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131818a913d5---togotebafigitofonesisivo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210904145031.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sezixonuwer.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/55905550552.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/moguginazanesijukuw.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161399b2d2289a---64897807230.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/11121425193.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631322203.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/38002543793.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/68219313943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ipl+2015+game+download+for+androidPDF 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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 18472 bytes
SHA-256: 135eccf16530ddd2b64a76715aca510f8030d61aa87e3238d237f87ea5950d4e
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 11040 bytes
SHA-256: 7b8466831c2e9416e12f6a9df77591fd38cac4ef26ee1fbd8cf4bc310756e7a6