Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e23f339d66acae…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 22:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8108fa1d09e586190c23f144c28a1901 SHA-1: d76b438370b6979b3809ea0d602d2b25518874bd SHA-256: b5e23f339d66acaee499ab58ca2ed57d989cb6cf3f93032503b549cd2b84f317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. Heuristics indicate a 'link farm' and 'compromised CMS upload' pattern, suggesting the document's purpose is to lure users to external malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.alborada.es/ckfinder/userfiles/files/beforumuxowivesurivizegu.pdf In PDF document text
    • https://markyatirim.com/resimler/files/32210875792.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/94667292710.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/dawudugabovikobekuse.pdfIn PDF document text
    • http://newo.ru/files/files/33552317886.pdfIn PDF document text
    • https://ms2oke.com/contents/files/salufujusoza.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/xazuz.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/55850205948.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/rukuliwasetoradobi.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/wodafimebifukasuwezofi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb88650438---3338362138.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/92084074993.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/bowulegixefewavuziwanezis.pdfIn PDF document text
    • https://robertbah.si/files/file/fifinimemosudufomusuxija.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/90168612191.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/60604130995.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/84718062262.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4cdf22f83---44869122601.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907124833.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/81470997812.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614114889d1dc---87121235351.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/zizewib.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/1558735100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cod+mobile+mod+menu+latest+versionPDF link annotation
    • 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_off0000b65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65A 10744 bytes
SHA-256: 4cf84b934c23393ea704eef30fc2ec3f3d51df5c4f2478754fdad6fdf2108b99
font_01_sfnt_off0000cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 17748 bytes
SHA-256: 4d151dfd0dea7bc7c05c701195126ce7d4c48d2e7e39a150dea3df00d2e06d68
font_02_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1