Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5d0262d1e2b910…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 18:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a28afd6e35368183826b6d81ed948be0 SHA-1: f5dee39911019c5bafda65909630dfb52ed66150 SHA-256: ff5d0262d1e2b9104e13805f5fe3edaf1bc28d169be9cc14c83c2d61cf2c3d85
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure victims to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.prodomasa.com/ckfinder/userfiles/files/nejasefowu.pdf In PDF document text
    • http://zaintik.org/files/galeria/files/90652902275.pdfIn PDF document text
    • http://speckrepej.com/upload/file/geworopuwigowodesusibawi.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/xotatanokerapunamigi.pdfIn PDF document text
    • https://vitanov.rs/files/84712451296.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/lajegozizemuti.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/13994399583.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/67b29ad4777d04ff76d20d033e8db0dd/kokazutelur.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/libonogewozutirodogo.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/bitodakatenenubuvefidos.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dbe1cf05c29e35e9aa86bae011028c31/38669680532.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/27870277723.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/kepogokasidibogufi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16133a70812062---66672462412.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/wezavadipevulozok.pdfIn PDF document text
    • http://pbpharm.com/upload/files/57970022860.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f253277c0a547d0b770cbca54b196fb/58732939765.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/siwuton.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901112518_zlkjrg.pdfIn PDF document text
    • http://vhshf.de/File/7976660218.pdfIn PDF document text
    • http://getem.pl/files/file/vevipik.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/35222387901.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/41260196293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rupaul+drag+race+streaming+season+1PDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/98755556657.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_off0000bcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD7 17012 bytes
SHA-256: 1c36cd848be85bddc1a8c6f53a8df564a40572b7fa447c7bf0338c13c132f780
font_01_sfnt_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 11052 bytes
SHA-256: 7af2913d6ff182a8a08ff62399b6520e98fb1ad8e40fd97fb7381dfec0dad7e2
font_02_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1