Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51e35410b3b20df…

MALICIOUS

PDF

95.8 KB Created: 2021-06-28 18:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f4ee900dc91022c0098a8a30cfe168ef SHA-1: c0f637b34f0c2ebdf226e8098638bfd57fd4b3fa SHA-256: b51e35410b3b20df37aa2b88db8f6d99b522c8a194c8c1de4ed873d8ec49df9a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1fe9ef02---xuwifepirivubupozexug.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e353ff2a---poxefemesa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fovepijasafelog.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ce00b63f1bd81304653f53191d1da921/pivobusutavevugazoxazor.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/86601462732.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/96726c04761862d006635850a12bc11d/zigoxewovepot.pdfIn PDF document text
    • http://candientushinko.com/images/file/fivilakelarepiruduw.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/37023175114.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1ac0670916d6676d25f2ddc6563d2b19/31858684652.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/25490263923.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd2f1a904---kajamejisubiwexe.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/t22qbvo0j7kthhkh2c699snri4/41514403823.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e20f51b93f---244311514.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9027b88dbc8406501cac173cf74d314e/5155979967.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/86797789933.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k0a42apioeqsnnvh81irbag6k0/53133949081.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/jijarekoferetiwujog.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/cc4c24ee82fdae954341bbd78f0740bc/laronixekazabe.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/gagefop.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f1bab2e72d8d69f900d38ec8c14a9cb1/pogogefoboxawazamavapukep.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad36d17e3---38496429252.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fe4e0a0bb5979f508fd420883fb4441e/fuwokisajomoxumafurotafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=your+beautiful+to+me+quotesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 10640 bytes
SHA-256: 5023c7463baa408bf68dea31af3254408d2aaba23a8634e24668c55b25d01e31
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 17044 bytes
SHA-256: 7d9104c59b6a3e6cec196c38b6b1e3ab969ab9269ab4b221eacaa9a48744636c
font_03_sfnt_off000159a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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