Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87bedb662dcf4c4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 05:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1771b6bd3565cda6bb4a8efe2bc07b17 SHA-1: 477c6d8a98408c3920fa6483bc9c2e42e5b7a40d SHA-256: c87bedb662dcf4c46f04a092c509df24510238bbf34721b26d62952a3faf03e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/65002960928.pdf In PDF document text
    • http://greatnice.club/updatefiles/file/86073499898.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/patatugatifutelojet.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/01/lafodijefosemijukajite.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/rodonubogokujonalejenobum.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f81dad0029c5678317e7a5d415232909/leduvubeporogomi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dba0fd64667d561c10be239fa27ad256/toduz.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/81291621565.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/dimifewotazegikonotomip.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/misoxebakogetolumelid.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075f10455b5b---41232683687.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-8/20210908080155660053.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/98910583007.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/bexetowol.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lij815aimba4lgc1nehpas6fd9/67549655634.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/89b86d5441901d63f5ae5544c9e81190/69477765554.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4j0v3bb0g1klfgp5o4q3kpmd95/ludebepomufituvabepo.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/99397035213.pdfIn PDF document text
    • https://susta.vn/userfiles/file/90801319350.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402ced2aae---tasin.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///zagazukomomosetomupa.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/66793ddfe0dc56fcffdb3b4e6398ad4f/xogorebevumixigiminuvew.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/jilofitebogisekejoguvo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b83f18c6f73ca0c01ba6af1085d22392/nurot.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/efbc3733748f49c73e5e175e9e70d934/miposavuxub.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b08426cc60e---95506441311.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/90968270140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cd4053be+datasheet+pdfPDF 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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 18180 bytes
SHA-256: 1caefee214e2c2064a2f9cb2664c28b36de2c0675a2b0d548ea23f8f03db9217
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 10812 bytes
SHA-256: b1b13b5112257ec9ee83a7089d884a5aa3059a104e5a2de444dff463e78a6f95