Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda73a3b6d6f028…

MALICIOUS

PDF

82.7 KB Created: 2021-06-28 23:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a828fa0633840abb9af29ea00664f3dc SHA-1: 2dc4a063c7d053d4f8441f56e97af60431a71595 SHA-256: dbda73a3b6d6f028033b5919205ac606b49686ec0fcfca8da8581e79d27a1580
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/81b84109eeafd81f26768130839d38c0/nopevizizefadunij.pdf In PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/a44a2ec135cf0be07e0ada2d85f3bd0e/43593036555.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fg2mk3uatblk3pp6ftlahtmcv7/15987850251.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2bce8eece3f6667cbdc446b58cfc1f9f/mevalikagabu.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/sarefoxatumogulojimon.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/dubawepamumex.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5660bdab03162e1d2fec404679040954/54004015927.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ccfaef8132fc39dc46b7a8e6820f7296/mebofusujododisinegi.pdfIn PDF document text
    • http://promador.pl/userfiles/file/17716941967.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072e34048e23---16470541702.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acb23495006---kedefumukoroneg.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ed2d34kpn6qm1q4a8coe8pfoq0/vajewojekivugudababuduma.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb8c3dbf5---loripopipotisamakufi.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/momuvokitibadelenige.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fc27a673f37790e55b291fd5d5e30aba/zajonapaxaxiwovupojopozo.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/zufodoj.pdfIn PDF document text
    • http://webursitet.org/Files/file/53152484995.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/67193190369.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/manise.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160736993203c9---18296599367.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/wazetuzimabin.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607808be0bbdc---85730997706.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20105abb54---98105442238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fish+simple+drawingPDF 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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 16500 bytes
SHA-256: fa554cfdbd43d489d0bfa65d5111a9492b72686ca816065ebcfce63561c30304
font_01_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 10684 bytes
SHA-256: 377e796c89391d6d669263ca4fd847c6dece610e867442afab2b6499a2ce89c0
font_02_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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