Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d11bc7f8aa9c61c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 14:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a56132d8d80bed41589aae845348ecec SHA-1: 93ee11d7cc796f48c1e0d7057abc2ed376236105 SHA-256: 1d11bc7f8aa9c61c41515523dfe781dd9729b6ff4bab168f89e9b1efc3d15590
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection by security tools point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=new+testament+table+of+contents
    • http://rheumatology.instituteupload/content/file/wufusovapu.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6p16cub4iuvodgj6tt9b7pcif4/61765635254.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16102b3cb7d979---46250116507.pdf
    • http://metallpress.ru/files/60806248374.pdf
    • http://skisun.it/userfiles/files/wuzisofamixigu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f33245b1---fowonopakel.pdf
    • http://tsmsaldature.it/userfiles/files/lukajaru.pdf
    • http://nuitsdartistes.eu/images/file/64921237518.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/092aa12f985e10d6ffb5ff1fcc1ce497/87142003596.pdf
    • https://commonwealthsportsawards.com/userfiles/file/73654566652.pdf
    • http://privatecambodiatour.com/userfiles/file/15656797399.pdf
    • http://viettelhaiphong.me/data/dulieu/files/98400925104.pdf
    • http://vinhthuan.asia/upload/files/50512646334.pdf
    • http://aweibel.com/Photo/file/62137735307.pdf
    • https://bikeid.net/ckfinder/userfiles/files/denuburabaregimubuv.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/falkduol6k64supndnna8ne5p5/72785923436.pdf
    • https://holycrosshealthcare.com/userfiles/files/83115109335.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a82ea01c3---rexanazafe.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/nuxire.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04bc90331053e102143e33fc1d957ee2/37669465010.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16070e69ef3ec5---3075467555.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2962b69ae---zasavuvelupaxolomelixido.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210524004007.pdf
    • http://seyrimerdin.com/userfiles/file/bosatedatalasegozixuxulo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3d.bin
57369b133524c2eed6b6f316e85ce5c5a61e3ead3f79fd394799ed589978d807
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 18144 bytes
font_01_sfnt_off00010ae9.bin
771b718b7d612083b8e1cabdfa70934bfd40d0017952148b54f97cae6bf3793a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 10508 bytes
font_02_sfnt_off000122f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 16792 bytes