Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa4af5dc154f5d1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 04:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32f0b78d1a62676fe1817700d02a9aa1 SHA-1: c28a7060dc7400b98fbdadd6162768cb98667575 SHA-256: 9aa4af5dc154f5d16cffd2885a24f1c6b72b5aae400dc5ac5b7716b6f2f5ea85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://infrive.ru/uplcv?utm_term=mathematics+square+root PDF link annotation
    • https://valgott.com/images/userfiles/file/77756291421.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/74991132865.pdfIn PDF document text
    • http://sro52.ru/uploads/files/logopuwovorubipaduw.pdfIn PDF document text
    • http://360global.ca/userfiles/file/93213150892.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/vuwerogurarafuxipegudi.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/femodalotagapitoxi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313cf1bb16---buwisuw.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/76772006279.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/54791599973.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f220d2b33---21381919659.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/lapomuxepe.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/govowixaxaboduniralubosu.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/63726421325.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/33993764157.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/kumaliwezuruzovidof.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/rinizurujovikitikow.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/83775812394.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4f64a961145bcce74034791ac6bae383/kazulusafi.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/77448175435.pdfIn PDF document text
    • http://sbcnepal.com/images/file/mabegirage.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/gofujuf.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/639998827.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/15563353296.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/xewijidi.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/89052113335.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/25419805265.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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 10584 bytes
SHA-256: 507931821a063c01b6e16d443bfbb332c4beae81705968b5c1a0ae0633c61dca
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 17492 bytes
SHA-256: ca18d10fc09d19c5ae9f30c27a91714dd6218cafc008d36d4939eecd235ab874

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