Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa98ddf47b5ed6c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-28 07:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99c1209cda0cc382b2f329e9e6f01d32 SHA-1: 71dd5b89db02d47ce96973f922d82137827c185a SHA-256: 0aa98ddf47b5ed6cedd12ffdc2934d46dba67e2b7d2559b2a827a4d5058dcfb3
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute further malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://islaminkiel.de/webmisr/uploadwebmisr/file/60587968412.pdf In PDF document text
    • https://sukienmiennam.com/userupload/files/44878342212.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464d0fd27d2---melezutefixovopewo.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xizomegedokil.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161526bcd5585c---vafimasaxibojub.pdfIn PDF document text
    • https://derfo.info/resimler/files/xotevuvuf.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/xujaguvilusijemoruko.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/sixovi.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/wezuberuzoxerajo.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/xexamu.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/38960208190.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/14579459346.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/xudojaverenedimerasekufud.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/43241159809.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/33983255205.pdfIn PDF document text
    • https://medius.sk/userfiles/file/juxigifa.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/32475210322.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/13252520569.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/30071172302.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0ffb850d96be902e0567a6bca047affe/25833282943.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109241201389003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=true+love+husband+wife+shayariPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/95646163630.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_off0000ba96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 20356 bytes
SHA-256: 3e594bbab494ad4b0727f5f89ad5ea47a37191aafef5c9a3421260c760eeef5c
font_02_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 10820 bytes
SHA-256: f2a03a8956b75abf6b6fdaf5b6e93b931028e21618b1421bddd98b856f295727

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