Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a83c02c121f4dc…

MALICIOUS

PDF

103.3 KB Created: 2021-06-26 04:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 61ec82c7e4d3b4bfec6b167c7ea9b28d SHA-1: fa5667d3921878f9590ec9b33336189347a36330 SHA-256: f9a83c02c121f4dc44875556faae9f6c7fd1788fe3dc98a60be70d3fb0734ea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm indicators strongly suggests this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=how+to+give+yourself+a+love+tarot+reading PDF link annotation
    • https://carsen.sk/editor_uploads/system/files/91828567957.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794a20f48a---97266202125.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03748c7d3---89927602721.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qeq7looestq5vdtlv14huge715/gufuzesamozimazexoxibido.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/749c6cfa88724269de609e4d70ab2266/rudefubudizodomoruzuvo.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/mizidoxiwefurafexeba.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/m96sjqkha0ve82dm12kdn7obm2/gadafununogigupod.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9d26069d3c5854af776ad3d8d303443f/60021371669.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/gatuwe.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/76951565511.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a284833e---bawebi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a2e59f84---92852057884.pdfIn PDF document text
    • https://ecoretras.com/file/40249951895.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d984b682d---duvubosuwitetexoputitogig.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/vavonimigukafaj.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0385859001624614242.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608528af372be---92961465975.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f2f27dcb---sigokog.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/28667491512.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9ff7278b737a189ad1c6b5effa1a3347/73741971477.pdfIn PDF document text
    • http://apsons.eu/files/file/pikopazedo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51a13c5a3---40903437154.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_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14769 17720 bytes
SHA-256: 2aeffc70f368923169586fa4a9a8a2a8d994c352f03c6e162e72b441f7c3a9cb
font_02_sfnt_off00017506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17506 10884 bytes
SHA-256: 862dac9903d098b8e5676a182501578e8acbe2ea8f0b1d8b0481fbf34d1a5109

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