Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd638a845e4c0e9f…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 05:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fd5ccaf98ac810b8ac10ddddf4969b23 SHA-1: d221fcec67aa348c130f21f3231ebe7d2110a7f7 SHA-256: fd638a845e4c0e9fe2d49cc140071d28ff3d529b8b8f76df96d7b5de4955ebdc
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan activity. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8c8d0b64---fenekixisupedosezatasebu.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c77d7f0f---zegorax.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5714b2a5---74987515604.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8aebe5e2---66366521086.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/115ce24aa0285f6034e09dd53afeceec/jobakuvipitor.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/37801123727.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/11640794064.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/zakam.pdfIn PDF document text
    • https://medtek.vn/storage/file/26798058459.pdfIn PDF document text
    • http://jucal.es/images/file/12482764622.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/3844447749.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc99a2dbe---37379986233.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757fa1cd891---nozarimufawu.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/52399176886.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210605_044232.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fr0jal59dd5rl8sq0fcltvdh37/xebepog.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/65279134575.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/59vjoupms9pdfp5ri29r80q99p/66233227629.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/10868643566.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/72617567003.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a22b577e0a6291dd56286ede9975cda/lavumu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pm18dtmm8drdpppod92f01bg4a/pufuzedudojafokenumutina.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082684b935a7---lipexad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=psp+games+download+dragon+ball+superPDF 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_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 17080 bytes
SHA-256: 16db344836acc592cf91a01d7fc92fd915427ccde44bcbef77dc65fc6aaaff9f
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 10872 bytes
SHA-256: a030a68fca412b06d3f46ce3e1c186a2bf6332a1a94e74b90a89a138ec389a9a