Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fd530df1a8432b…

MALICIOUS

PDF

106.9 KB Created: 2021-07-09 04:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f552f7ebea5e93499046c883e4d9d525 SHA-1: d2432a5f2a406ef5423f6ca5b3b8c0ebc3d5c503 SHA-256: 54fd530df1a8432bdaa855648b4adc3f8fc0db9df5bd81faf0fe498e2239411e
196 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external PDFs hosted on compromised websites and disposable domains, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security and deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leavingcare3plus.ch/userfiles/files/fijekadetirodiva.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/dd3fde2d2892a45038597f4991f95c87/32341705300.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cb106530e---48642380922.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/76968700427.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160712130b7843---perepezusog.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/lonovumudifeb.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/71029747699.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210603_1673B7DC0A74AA70.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/12935989847.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/fomudike.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/xamatexulijufekum.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3970d597d8---busimifekinizi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/bokazawufalirubixafijop.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70eecdf98---sinevizegumesedivo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba80375c77---17037972701.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vuwadi.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/75536680198.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef15d6edf---zizigogapenimuvukazakaram.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/70592862355.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e95571ce---wasudubesumokasas.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/menuverepupajipejijinek.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c6ec0e67---51868002841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=guide+to+unix+using+linux+answersPDF 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_off00013e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E06 10748 bytes
SHA-256: 8358801f12bc85d7970dd2e77b10f0c8f9b8bcaa7158032ad77cf60c5da225a0
font_01_sfnt_off000156c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C7 17956 bytes
SHA-256: 1ed9584083322a27d3ca745f3aa6baa201527ebf99b9c1cbaf093756160fe1d9
font_02_sfnt_off00018651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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