Malicious PDF — malware analysis report

Static analysis result for SHA-256 84998910b0e836fc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 23:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eeac7e8c3b1f2a480dbe450328cd4cb0 SHA-1: 4b8cd93aa3f2c83248726418d3ef387fdd36589c SHA-256: 84998910b0e836fc146c99fcd9615921d50eeec493af65d92ab3d43250b08646
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nazrabilisim.com/calisma2/files/uploads/71065197465.pdf In PDF document text
    • http://arkystudio.eu/userfiles/files/11588756557.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80574941181.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7cf7c0d8---fifimewexagejebokotedofog.pdfIn PDF document text
    • https://alariel.be/userfiles/file/13648548311.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee77b31f6f---82836535750.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/67803879311.pdfIn PDF document text
    • http://com123.vn/uploads/file/jotumepi.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/93700806124.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/rujovinovesifu.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/dunomugetexegivogoru.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/bezuj.pdfIn PDF document text
    • https://somogyplusz.hu/files/40010143751.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/fudomujasetatobilowoxa.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/18229977845.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/48132963334.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdaa4e94d---nalobovaxakup.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/85120362881.pdfIn PDF document text
    • http://szwygs.com/upload/depimajow.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/xinedavutapolonuxone.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/67dc4f9fec39ec316bf74c22090dbd23/rugiruxujovadokofubimid.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/23465294921.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5d740cd---2935224296.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/946ccv6pfur00r35ueefuhphet/58068456453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=becoming+supernatural+pdf+onlinePDF 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_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 17864 bytes
SHA-256: e00c0a35f7d0a52e5e5a6663b4039a782b0c191c2bbc73bee3cb2d5e4148f0bb
font_02_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 11116 bytes
SHA-256: bc44089be59bc7c56691b56203b21f09311904996e0250bc87e467a49e2ba351

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