Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dd2a35196ec569…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 20:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab38a2bbbc79e303830233251c0ba847 SHA-1: fa731882bdb46253a2dd32110c1b5ae0667bd035 SHA-256: 33dd2a35196ec56918f9ad3fb047d2dab5905e4afabe19ee106c29c77555dfa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pixomot.ru/uplcv?utm_term=download+the+app+ghd+sports PDF link annotation
    • https://protectname.xyz/whoisprivacy/userfiles/files/galusawibubu.pdfIn PDF document text
    • https://salwangurugram.com/files/80060112787.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/10031604614.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tinefuzaxuv.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4483b33e2ffb133032055f6df884fd57/91774952529.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/wiwemufilixok.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/56502638986.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/21045704869.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210910202803.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/pamadij.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jogokesenefidaj.pdfIn PDF document text
    • http://infosierra.es/images/editor/gitadakekeroku.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/latetisamidukuledod.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/wituku.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/rizalozetujebo.pdfIn PDF document text
    • http://erex.hu/upload/file/demelomomuvijojukela.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/sajajotasewojelobinup.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/59064958542.pdfIn PDF document text
    • https://arendic.cl/files/selakegikir.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/37465974025.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bozuzebikedet.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139d146a6ca8---34636799090.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/xaminezivadadu.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/14901517518.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6b12cc58---latusajudulof.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/88658608614.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/gufibefidaditepikuleniwo.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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10668 bytes
SHA-256: 3acf38c54abaef0bf333f45568bc142ab9d7004050965f847ec710407a4985e9
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 18236 bytes
SHA-256: b76238a9a99e612f36f36f92f87b9d7ee57b59d141579029f888b9f5ecbde267
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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