Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f044448c9eb29e…

MALICIOUS

PDF

72.6 KB Created: 2021-08-28 18:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e8026008ebe4c30e88865fb0263c498 SHA-1: f13629da94503bc78d00bae31d7dfd6726fbfcc0 SHA-256: b5f044448c9eb29edec9ffeb0f8dc594ae72c44573fbcabf3ee236405aa4f924
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content or phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/nl70m6avs9996thjlmr0bl4ha5/98617920911.pdf In PDF document text
    • https://aokman-drive.com/d/files/samobepadaliv.pdfIn PDF document text
    • http://nakatka.com/files/file/jipujuxixivarusikedafutaf.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/gunituzijadov.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e74832486---levajojidokibiz.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/71577946333.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/50360720962.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/vafev.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a37852f45---51388271024.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc3e63783c---putakato.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b89e3701b---pexiborakim.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a930efc04---tedazeferusawojijaz.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wazafeligojitajapemekupe.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108190624494656.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/tasozafukoturulisaxi.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/piroxes.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/xotigavexugub.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/rifogazarisavepesefanakan.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/12695877576.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/55775197660.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160769aaf2b13b---8006450941.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/fidiboriju.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/509d73ddd37a9ce9168fff450cab844f/35354722602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=thing+in+back+of+throatPDF 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_off0000bc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC77 15772 bytes
SHA-256: 5c36ff881a663e611f63a59f3b68578813ae17420390cfb3f3ab4c03259380d7
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 10464 bytes
SHA-256: 505b23a2f0eaa3663b3a04918111a99927b5f2d314a3747ec78a147e4cbdda41

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