Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f92a02f77c25fd…

MALICIOUS

PDF

71.5 KB Created: 2021-10-10 05:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c82f21015ad2e56127e5800d9d11430 SHA-1: 73be10ee4f66d1e5968e7f5d6bf16d87a5ed57ee SHA-256: 69f92a02f77c25fd23d08373c565fa82ccdfa439f56e6f65a91ae534ced900e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to host or link to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification as malicious, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nusantarabet4d2.com/contents/files/kitawilizufajefotenu.pdf In PDF document text
    • http://zhuoer.ltd/userfiles/file/ketigosavegogax.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/15515553535.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36422887875.pdfIn PDF document text
    • http://diepdoanhmetals.com/media/ftp/file/xulewo.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/96574203634.pdfIn PDF document text
    • http://minerva-collection.net/files/files/ziranarunagebebiwajado.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/27077945842.pdfIn PDF document text
    • http://sun-tes.ru/files/file/xemidoboxojaze.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161403e7e7392c---10989956392.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20211010084632.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210926_075513.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/59033257881.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35159d690403ee91ba2d71b322576aaa/nimafewo.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/90fcc38573d14d4e00449e1484df1cf7/38840846794.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/gopirabituwelafagatazu.pdfIn PDF document text
    • http://vladekoservis.ru/files/pelovewewurede.pdfIn PDF document text
    • http://kccmaul.com/files/files/gakojixisusanipukumebiz.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b72ee6e207---mirizarog.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210915224611_gwhput.pdfIn PDF document text
    • http://anninhsieuthi.online/upload/files/faxaxepimexer.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/685cd61c9b580d51f05ac05b84e7c037/23953870345.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/rekuxakikarotazewan.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/5574092092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fresh+prince+of+bel+air+s1+e1PDF 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_off0000b62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62A 16360 bytes
SHA-256: bd5eff8a2ee48ed1fa602bf8bf2740cc4b1790f06b5110505a5bbcd4647ce4bd
font_01_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 10648 bytes
SHA-256: c87b53e32bd702ce33e1cea91cec9984c92ada0f602b34e900831c6cc102baa2
font_02_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1