Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1648203201058e7…

MALICIOUS

PDF

80.9 KB Created: 2021-08-11 09:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eecde5430f2166e20dce8a1392d9fa26 SHA-1: ada0f9d3896d2cdc3845f85f744e12a2e79bd77b SHA-256: a1648203201058e7f58657cf5714a41e9a2e83cb6885b10f6a6d33036a251739
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://modelseafarm.com/kweb/ckfinder/userfiles/files/naroninumatosofikuxa.pdf
    • http://kmsenior.org/file/files/19165604720.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gajesowin.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/velitawagazadonubavekomew.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/5600250113.pdf
    • https://scapetime.net/images/website/user/files/sotoxikorumubexugeguso.pdf
    • http://barudan.hk/UploadFile/file/20210627122942330.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ramasgc7lulaiaph5cdjk598n6/51473140371.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f94fdf8d495a02a17a3bcc58e5d4590e/wuvabodafozo.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096c01d35e1e---wenumipig.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-8-11/20210811094245786964.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ba6e2641a---xebogewiwowenijudawu.pdf
    • https://ferado.vn/userfiles/file/38730569196.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d89c5bb1cff93421c2a6ebea007bd52e/76180554247.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c7d7p0jj30q0b8kgqqie495pd1/14956222291.pdf
    • http://www.niziointerior.pl/upload/file/zoditutogedumawog.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e26e053c---girarugag.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/09n557kalvp3sclktkgd7ct8op/vezavodidefejezologidar.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/1df236d3a7c2df0a7a92473afcbc2d2e/5590622341.pdf
    • http://scbczy.cn/up_files/file/20210730_022620.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab793a9e92e---24994938841.pdf
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/gaxuwojepalizisifafasa.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/pelowumokesogikosu.pdf
    • http://wittlich-luexem.de/userfiles/file/62408911302.pdf
    • http://mtecommerce.it/public/news/file/rufaboxafamam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=section+d%27un+t%C3%A9tra%C3%A8dre+par+un+plan+exercice
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d676.bin
1f81874317055944f3b16197f2e68910aaf62c011536e2fb76666d33385b1eff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16912 bytes
font_01_sfnt_off0001019f.bin
b336925fd9393bbe5109a1a80d6f2ef12dcb4e73e1ee0f3f8d41736374fa8355
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10960 bytes
font_02_sfnt_off00011a8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 16792 bytes