Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a56b3c2e977de4…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 05:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 968808a1d1c272558a07796af18a63b0 SHA-1: d40d16e5027cd57b2c5a9d2c151f9b9c92cdb228 SHA-256: b5a56b3c2e977de4c25fc638750fdba6c1071209192572e56402e6c720b34809
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/74519627643.pdf In PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/68495439274.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1cee34c73---52281026572.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/19291911989.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcac361821---22881415025.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14c8570c73---5468589091.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/99552443824.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16082d18b851b3---dovabuguvuba.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/60862916228.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/pubomimatidavug.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/46624230078.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b3c4c18cb20d811a591d2ae0f8457f24/mujakanifare.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/407458953bab585341453d2cc45dfe8f/25529943254.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/2527606692.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/m27qqq32a3fdknlo4aucg8ig62/53173727355.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fe599e91---3721974437.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/2799510495.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/kepizomiguzamunixesex.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a5e792891777aa220ffb7f1a4b622f08/279491448.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c50e4b8c1---fobemorijokobadutuwenejaf.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/baec9ea5edde8abb0c3d3af48e427ae3/26692096959.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608162c6dbae5---56345489022.pdfIn PDF document text
    • http://kleiberit.ru/files/file/gosebe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2mtu7pb4v0umo4du2ituqhgsjb/43462209466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+bowditch+and+transit+rulePDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 17652 bytes
SHA-256: 068ea7b538f2ec8498fe826b49651312b373b415e2d718a813d72c30b3017367
font_01_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 10900 bytes
SHA-256: 8c35d579d91cffb08dd61318388a5ac8217b970e8bda2b8b9aa960c4561e03e9