Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d489333da77074…

MALICIOUS

PDF

77.2 KB Created: 2021-08-17 10:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4e310d04290fa89e1f920d7a1b73dfc SHA-1: 228f53db0ae950c41299be7a663af0449f652db3 SHA-256: e0d489333da770749c1273f64b9b636067ce391e9b4cbfd9050061fb158d49d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The file's structure and link farm characteristics are consistent with techniques used to obscure malicious destinations or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://usmleworkout.com/files/file/21891147120.pdf In PDF document text
    • http://dulichgiahy.com/upload/file/puvamulunok.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767960c33ef---pujafapetevokap.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/tabadodupofamajele.pdfIn PDF document text
    • http://groupkaishan.com/d/files/sozebapoxowiwisosowute.pdfIn PDF document text
    • http://talleresjpg.es/img/file/gonemopirifewonigiruwu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kojafipav.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/79606683240.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b4ceeee4da51ea70afca5d1f09fe15e8/90081375163.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915bbd7d19e---bemamirirolibodoweno.pdfIn PDF document text
    • http://citralandpalu.com/new/pics/file/bamixafisonosexano.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/gorubirerilefiwagibo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/07d3724d8df01e480487b3a635bba6f5/pejiwejagegofumugafugedef.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/99920557226.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608216660a227---kudoxurenumazu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515abbeba0---rotumojubuvenin.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/xukegixob.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb080d0c95---19023756757.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8d373a05---70060163889.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/41214908422.pdfIn PDF document text
    • http://hncastlecable.com/d/files/6749916695.pdfIn PDF document text
    • http://didula.com/img/file/88471037880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=short+comprehension+passages+with+multiple+choice+questions+and+answers+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_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 11476 bytes
SHA-256: 46f4634f1db89eea3f268f36030d7c4fcd91db07ee5c4388746d7afab8d23d56
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 16188 bytes
SHA-256: 90db72de3237821318a3c1bddeafc191b57b228fded5db3be4fe924e1df67fbc

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