Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf84efd78d3339fb…

MALICIOUS

PDF

83.7 KB Created: 2021-07-05 03:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35066920e82cec1f90ab8fa7063b63be SHA-1: 6cdea6ad2011b2689c1b9818e3ac43cd1fecfd1d SHA-256: bf84efd78d3339fb2954c435eadd55f71cd0941bf290e8c8688478431bf674bc
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a malicious payload. Several heuristics point to the document acting as a link farm, with many URLs hosted on potentially compromised WordPress sites, suggesting an attempt to trick users into downloading further malware. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fapannimario.it/userfiles/files/ninesobukawuvokujarogobav.pdf In PDF document text
    • http://bociany.sk/media/file/bovufowatopu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d66828ef91da963e4451e840b8b5ed0/siwivagoruranuviwakipibu.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/tawepuluxanixibinamusebes.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n60ted5ba8khokhrdkd2qgh62m/46072540342.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0413c5ea95---ruzupidumagiw.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c9e74a3b---mosidutoxenun.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/09l5t0oq8sklar2qvcv240ga20/figepodasiriw.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d0ae4292b---dedijuved.pdfIn PDF document text
    • http://dzbnf.com/upload/file///56177446263.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/86319112899.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/mewozululetipewot.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/buvujigupefexubadubavikuw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04be79277---74063183377.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f55357aa0c---23265721315.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/290893uhqfd2ube2vgvpjddsj1/5717705442.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/32761175316.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c333d46e61---84309546896.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/1gsummc8h75a2btsk2n9pmnepk/36702606771.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/97c900947eaaeffa26070b712105dc53/varelawugozatemike.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/65744900207.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef62eb3a1---mixufesonarefogo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/besoxuzakutumuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+show+ruler+in+office+365PDF 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_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 10920 bytes
SHA-256: 1d74e744c266f6f109f93a04a577d17cce523d8dfed05c72e167f04fddd046fb
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 17168 bytes
SHA-256: 5a2b2022b18ddad80c36eb953e6f006b4c199e6a5a76649138b31b55a102ca15

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