Malicious PDF — malware analysis report

Static analysis result for SHA-256 e458ceb7140d69c4…

MALICIOUS

PDF

69.4 KB Created: 2021-09-03 00:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d3687a6323092f7c364efcadda0c0ed SHA-1: 837c78e4f953b86266d3ea74d4cc3e82c2d889b1 SHA-256: e458ceb7140d69c4b446356243e4b03242169892058ed72c43138b0b671a7da4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage, likely intended to host malicious content or redirect users to phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ab2e8a394---supabarofediwaton.pdf In PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/luwoxefazodirowet.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/70522610924.pdfIn PDF document text
    • http://davcpundri.com/css/file/lubokujinuneses.pdfIn PDF document text
    • http://24cvety.ru/upload/files/pukuxul.pdfIn PDF document text
    • http://gr-chem.com/upload/files/97323213027.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/83044980237.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/264bf6371ffc81018a7def1ce26510ec/faxanilelirumumegulozege.pdfIn PDF document text
    • http://imaginove.eu/data/Files/50797138757.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/rolatepupi.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/12775644378.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff38d3d705---dugeremun.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/82524190841.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106081211068415.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3a14f5f2b3c5bc0fd87b8e19beca9803/farenuw.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f1a26f10b4bf342c9c39dcef5a560517/53151948934.pdfIn PDF document text
    • http://lucann.com/Upload/file/88164043582.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15341f46c---16482771525.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/46899755151.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9d016fa4c88d7e4a45a6bbc7f4222769/nifazed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=proteosoma+estructura+y+funcion+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_off0000afbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBD 15232 bytes
SHA-256: 670bdcedcdcbba8ea9dad39e0a1dbe0294d407f518bf7c831ae078f49556f47b
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 10952 bytes
SHA-256: d1a2e8f065230c74f7076983282cae9a101d4ecc4837419ff0a458fb4aaa698e
font_02_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1