Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2f5ab3db40fd60…

MALICIOUS

PDF

77.4 KB Created: 2021-08-10 23:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35d0ac59b251fe720b72a19ea2abb122 SHA-1: f173dab5e7d89e261ce51045a3659feb935d2f76 SHA-256: 4a2f5ab3db40fd60510aa31d5314d572bf6ee919664daa4c60512557a515e654
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=simulador+para+el+examen+de+oposicion+2019+primaria PDF link annotation
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/19786578897.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d34efc52382f47255dca1a1d9c37242f/bupetowiradepoloso.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/rolefenexesig.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/85ce19e1bb2336489bebc845b4014003/40902865542.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/kuroleravepekoxajawamawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161093d345f93f---vimafesujoripe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9530b973f---tovisimutolageni.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/49713712302.pdfIn PDF document text
    • https://shopabrang.com/images/files/polixijup.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acca0ace96---mudosegipojadutovumabodos.pdfIn PDF document text
    • http://glttek.com/userfiles/file/96580988366.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/sugawu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0739c8795c---81816284502.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/99787155092.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/wonabametiditetaxok.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7713585e7265e924ed6a99817d10dbed/54962143936.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/55315179217.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/meliwidozi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160909e89a0bf4---57003483986.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/wofatomozelurazafug.pdfIn PDF document text
    • https://ckmandarin.com/uploads/53447233022.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb23baf333---fumazededotaseje.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/buwabizut.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 17380 bytes
SHA-256: ea1e4fbcac7878d60443811ad9fd749c5b78450e8bd77306b1d0d1bc5570612e
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 11316 bytes
SHA-256: f08e73781bfaae1d5a5079fbc1f6bb4dd6a20cefa491028f55e243cb3517c805

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