Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2fa10666f1f61e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 03:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e873be13594b591e8cb8423c5184f26b SHA-1: e1d301c6a4ce2348ff2b136ac2b1b5e1477f6efc SHA-256: 2a2fa10666f1f61ee4b55f26c38884339369b7a805a0d02ccdc01cbc176f2cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the use of compromised CMS upload storage and disposable hosting for PDF files, suggesting a distribution or phishing campaign. The embedded URLs are likely part of this infrastructure, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8518e4a9d---16808993027.pdf In PDF document text
    • https://artenika.pl/fck/file/zivotubobaxejixuzamet.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/xuduz.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/muwakexukabip.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/wipaxelinakojoge.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a9578cb24---lusigadisamipudigito.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bfd4125802ba1e392f7fe4e731d77391/59757384583.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/88532a4ff031294f220bffdac4f64c89/35768733187.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/zuvol.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/pisewivevakari.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/90942265431.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673ec73ecd---98640299425.pdfIn PDF document text
    • https://tsegypt.com/file/dabatenag.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb06b17a7e---62741708754.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160890993d4c3f---pudewu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/1189683102.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/tbvcipfkvk4hfletp0f0sg74n5/losoxoxojulozoraratetu.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/99390209085.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/37949180982.pdfIn PDF document text
    • https://icbacademy.com/upload/files/lewezajusesozonorebu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160973ee450426---sarevuzurejulogaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+beidseitig+drucken+englischPDF 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_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10808 bytes
SHA-256: de803da1e0e01574b7dea099446066c7633dd3307db3e5e573412f0335496627
font_02_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 18904 bytes
SHA-256: be711ca1331f6f46d42d16a54e96fc962a586e51bc5c29ad53af19d852ef9308

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