Malicious PDF — malware analysis report

Static analysis result for SHA-256 32762a2f7c10bf5d…

MALICIOUS

PDF

71.5 KB Created: 2021-10-06 19:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 613b67ed9d214862eb9c0cb7c0a473f6 SHA-1: 4494067871b3b9102a12ec504d94a03fd5bd6845 SHA-256: 32762a2f7c10bf5d24fbbc776fb982cfbfa1f369430988e9d585845d15347d4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://irlanc.ru/uplcv?utm_term=tenses+in+english+pdf+free+download
    • https://nhuadailoan.vn/upload/userfiles/files/panirudazeb.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16155d7ee22e19---ridodexizininiwis.pdf
    • http://leylasuren.com/images/userfiles/imagefile/pulezivipobofelawa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/telixopaniw.pdf
    • http://hfnhsw.com/upload/files/xixalezopovowibamuzego.pdf
    • http://chongthamnguoc.vn/img/files/xavatafejiso.pdf
    • http://vstarmp.cn/upload/files/20210927_143728.pdf
    • https://darshanam.com/ckfinder/userfiles/files/27616421852.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/nipebukavifeko.pdf
    • http://aurastaffing.es/upload/file/lowiladokatizid.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c6e673b467f44702eb0934b8f9a989b5/nelogopinus.pdf
    • https://sadex.pl/fck/file/voligox.pdf
    • http://abwsalisbury.com/uploads/files/liwezilinofe.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/suxajewin.pdf
    • http://brenno-tojestto.pl/userfiles/file/bekebajezimogukapewej.pdf
    • http://web5gstore.com/Files/files/jafoxok.pdf
    • http://www.saito-ken.jp/userdata/file/kavis.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/76170817994.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/73959863706.pdf
    • http://rentaruedas.com/files/others/wosuvikifabovog.pdf
    • http://fusiongrup.ro/userfiles/file/16168615182.pdf
    • https://bunianco.com/other_files/File/28802608621.pdf
    • http://xboxheerlen.nl/userfiles/file/92839456946.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c5f951f77---57473634961.pdf
    • 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_off0000b7dd.bin
5f0da3293ee5c0554661f2a2cfd8b7ee64e38a0a21ecc22046cae30dd0a8840c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 15732 bytes
font_01_sfnt_off0000dfb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
font_02_sfnt_off0000f7ca.bin
48930c62115a0808ac6761b039bd82de997cfc30774b672a66f6e9f3598ac5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10728 bytes

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