Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2ff8c42cf4f022…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 09:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e195ef53d55323ebe2416a927e6f555 SHA-1: 3d48bba196d554686f30b7da1afbd668d240cd1b SHA-256: de2ff8c42cf4f022ee78bd5568b17352865023ab0f4605fe568eaa2d58714b17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=sonny+with+a+chance+season+2+episode+23 PDF link annotation
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/49276585145.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d3ea569f---pufisirowazatajesawelavoz.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fqddj2jsfem98bgc787a06v0m4/47752279084.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/sojesawobanivorirutotol.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/81901575101.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/konujopebujiwigatalad.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14fc332abd---nituxuwad.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/bfbb681fe6f9feac073597c83abd12d7/76773042716.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea4f7cdd8---21059396944.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/buvoxemazoguresu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tenufagiwegazol.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/11251909669.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/tovemusenalima.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/vazusowudebesezosubote.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/tapavugu.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/nanufukojesevemegimitedi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d725620d0d7499c8f081a8134d516f63/musezebu.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/kapevalot.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/73300527126.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/635834272.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d137fccdc5---jemoximoxegiw.pdfIn PDF document text
    • https://advik.net/userfiles/file/26126205843.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/givuzomusedufiwofofefusu.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/96965965347.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/mawifomuzo.pdfIn PDF document text
    • 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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 19764 bytes
SHA-256: 27a2451fe3baff71d316df96245d3aff968918bc994dd263ca93521f68f6148d
font_02_sfnt_off00013440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 11032 bytes
SHA-256: ded4dd865deb95615f135e9a5e7c1facf7594d9ddbe15df74eabe91882823778

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