Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b3f8a70a6b4f85…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 07:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a9378f29a17dcf7cdf7e3b542a3ab2db SHA-1: 25788cbf1d35b241321f91e6588ba635ca66733b SHA-256: 85b3f8a70a6b4f851bfb8cfc816c80ebcd1a853c92609fc3f1d189064ef449d0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7bd17be---1749489222.pdf In PDF document text
    • https://estoniapools.com/contents//files/nebeluram.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/86449461816.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/zerusikafifuj.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nitavidiku.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8a8d3fbffb77870c1a97e210ebb9008b/lexilulapunojopuverurume.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210517213408.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a578bd97cc---40568089168.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kcacst9t911cl7i1h2ac6t5386/43615400559.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/65332647559.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/00968e921ff6a68c5afec6221df3d2c1/juvusape.pdfIn PDF document text
    • http://e-hane.com/files/romone.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/98104867856.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a061c80a5a4---turujiti.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9548fb4a7d484bb3933d32026ec45cd6/xajugazifugokisanugune.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2b9984d6---dogiwimux.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d70ae5c3---simukorogubopudijowimo.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608af37bd9310---57621176688.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95964bce3e---37736493367.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e2698d594ef63df015a9ba3133135ebf/kagumafita.pdfIn PDF document text
    • http://medica-brno.com/files/tederukaxameneposomekalef.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609463c122ab9---65950985982.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737fbbdf0ce---49009763661.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a8275b09a7bfeeb489e177419171f24d/20482420238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=song+id+for+wrap+me+in+plasticPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 16916 bytes
SHA-256: 2cb5bd315bad83aa31a58dc86e2c2a0ce4ca91d5f5a18815a1b7f8c877e3c94a
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 11124 bytes
SHA-256: 81bdd2273481b04afd2084b3aaaf0fbc0834eb01f4ad2a4e63349261b87852d3
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16240 bytes
SHA-256: fad5dacf09cd1b43314537240f9f06457f0671f261c0d1ec505bc4c7454e8b9a
font_03_sfnt_off000133eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF8 3448 bytes
SHA-256: a8dbcabd60cfbabb8daa6a0139356ff958868627e3da6284be4ced7f9a891e82

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