Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bbb32e8606aeb6…

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 14:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e411be2469abc796d38221f3bb510bb9 SHA-1: b826b243bfdf5732bfea9e99a4d0bbe6bd3534d2 SHA-256: 53bbb32e8606aeb6825469e374fc73f1af574b30f2f5fca78e4a7d2c9b32bb71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9tcocha6cdsqp6dmtj9cj7sdkd/6216141588.pdf In PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/xilopiz.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/23782281770.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/xijopimek.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/13876257683.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa97a8e57---9577668926.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/27106652275.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c0b7cabb---16143948691.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/99685711807.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r9m8g8rhpouo98o11rf8r9grd8/16727516982.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7c3893ad---rosoxujiromofezejawudi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa00687a23---99653503238.pdfIn PDF document text
    • http://dogable.de/userfiles/file/4322205978.pdfIn PDF document text
    • http://swadeministries.com/pastor-sammy/upload/imagecontent/file/bilotinete.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f594f0704f---48442726799.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/liseb.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cbad936a---63901952370.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/46dcf8992ff1ea9917ff63c1d5a78e31/pofumomupunosizonewi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fb6b5427a---defibofi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089252164c51---87583779963.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/18d25ac68f799326208d42973ab22db9/rowekazukiwifuxopanax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+into+the+spider+verse+online+freePDF 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_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 18644 bytes
SHA-256: a4e8359f086a8da3f26535cb17e8c144bac4e26f337ce97c7c43007789a7e959
font_02_sfnt_off0001427b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427B 10776 bytes
SHA-256: d40874a3c49eb1621df888e4c70c2b3c23632891ad145d65ef0d82e1e7b389b7

Open this report in the interactive analyzer, or submit your own file for analysis.