Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a54d96b5bf1ec2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 17:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9ca2cf476de9101ac5483c0e775f80f SHA-1: 139129846a9c2c6d54cebb470b793279f07f3595 SHA-256: 81a54d96b5bf1ec2f36547ed1bc6b9df2e308406ab07370adf241be607b1f13a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://world-green-hope.com/uploads/files/70254821814.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce24abcc1---lerix.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/32750169043.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083386ad0404---39349761458.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/91038008212.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lifamim.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/7489ddf21689819da8d2c1a1ffd2bde0/sevufis.pdfIn PDF document text
    • http://bptramptour.pl/files/file/59654481185.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608606ef4aa15---galazupunuwugobezupuwi.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210719_A4A52AE14271A222.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210825050712.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/xafazobudex.pdfIn PDF document text
    • https://brs.jo/userfiles/files/lofanexebotibazuno.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zewiliwivabunesaxuvun.pdfIn PDF document text
    • https://digireg.se/upload/73123787677.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/goxotozulobalo.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/kemipikubojabi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc70e2bb0---40581987212.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/gudesivipunuzeno.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae4b93492---gosozege.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/954185fe7b350fe038e267018f81ae9c/bezizam.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/edd5d1437adfd2bccd3c66563a83c1a0/reperabokifeziguvila.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/sisimuvapik.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/66262154318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=paracelso+pdf+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 10528 bytes
SHA-256: c3d74e805039fa611bf67a421bcf57fee338f4877d4751b89cc466e0e384fb7f
font_02_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_03_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 20480 bytes
SHA-256: 35a48f935708c3bbf71b5a5df419fbe0c032962a3297a34fb500a12f4516feb6

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