Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8dac064c12d5a4…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 23:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a218e40cb4c8b70fca5111510598e0fa SHA-1: a497e8e4b60cb4a32d1f9e5165bcfcb08e7834a3 SHA-256: 6b8dac064c12d5a4d3dd65a01715a1aa8440c564bebcc0abdad9359887c0c43a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=light+chapter+15+of+class+7+pdf PDF link annotation
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb708db7e5---wezevoluw.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3b83ce50f992d828fa92606746626042/ketela.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/76911229383.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/miworaxijesegugokidigole.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qj288ofabmno8q710adi378hlf/rekelunujibala.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b40b49ea6---85522420600.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210608_101755.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891bdbcf423---rufugewo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608714c5e4291---beruwibezugudifepit.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/seguto.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hlni857htph5l6tmfeaa2i8d2e/ralupaxugobazodimo.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/wakavezufoxulibabu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53f5b56784---pezuworosatelot.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/damugigimemebarituboxo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/78qojepa2g75i30og4ecfkse43/31005228793.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nejaduk.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/womozokalotorawanufemeged.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160705c1cb9f2c---49233286742.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607027595832d---gomamitetak.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/90b9a9b91f7518779549a98f632e87a5/90883662342.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a39accde19d---2000074236.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902d3f3e7a9---sejivit.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/661dd964122d91651e27dabc37305ae0/89389906672.pdfIn PDF document text
    • https://lecapsuledigian.it/file/pipaxatixarawusutolun.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b655c045bb4---jutari.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011045053324.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/253bf33ab2a6f85a58d88d2e3a4eb99e/98259672907.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 10988 bytes
SHA-256: c575ade4cee28e21ae715b489165ca6866f742c8b8254bd125f7a36918986414
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 16616 bytes
SHA-256: 01f1bc37bdfa893b3faa63e5b01ed5259d4c591fc87aa8cf54538bf1345b33aa

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