Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b79255f7fdf2d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 01:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45ec0cbffc43f3b7c8c307cc1bdfabe8 SHA-1: 0be5f25d9ca352ccad0db675345a12a8cff477c1 SHA-256: 803b79255f7fdf2d73d4112c141f0251f1c264d5031af41af8a131bad2c3547d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic findings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8281b8141a3faad6b3db7a2fa8f6c567/994047274.pdf In PDF document text
    • https://scalper.ir/data/files/file/83513748111.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1338c939---85296370191.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vreooskevhdftsmar4i2ihe4a7/16292822907.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/pinoxogitiretuxowuzuxa.pdfIn PDF document text
    • http://jucal.es/images/file/27683096333.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608518c360420---8268569315.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/magaxetekumerazevumegu.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210728_114321.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/genaletejinogolus.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/63587305987.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/pakojuva.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/73882653233.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/95832981835.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/71262722470.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/lilalirupifelopax.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/lerezaderizupomo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2bc3b374ad08c9baba07c44da23ca5c4/lefojizifesutogaxomofukix.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824d24509a3---17336463627.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u7j7np8e522hbcdarig6cj73fj/xurefa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca5655968---77862580779.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/fubitafe.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8786d680---wejiwisekewibakenej.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e1806b63f---faragexizoxamemekupokik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=linie+1+a2.1+l%C3%B6sungen+pdfPDF 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_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 10864 bytes
SHA-256: 78d100ddc3a3d86f33b88d10bb27215fc0056f8e60f3f83c998e9268dfa72b28
font_01_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 17400 bytes
SHA-256: 2e1d6b2c19434575aac79c3ace40679ac38531c5e9eebcc17efca3536aa14a8f
font_02_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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