Malicious PDF — malware analysis report

Static analysis result for SHA-256 051970d6fcc85721…

MALICIOUS

PDF

91.8 KB Created: 2021-08-03 17:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 01e1285e35aba0bbfa4bf7c445815a8d SHA-1: 3b92a8c5e660ef225a731820063dfb5795695178 SHA-256: 051970d6fcc8572129f8965dacd554e18cdbd11bcad6c6ba3095bf42abf3e1a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are part of a link farm designed to obscure the ultimate destination, potentially a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2192a8d11f4ee833018a6994c583a843/sinuwajugazimilesirevorul.pdf In PDF document text
    • https://efficimm.fr/userfiles/files/70320544535.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3cfa91963d585039a8aca9b55f659067/kadisegofadosaruz.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/18423379884.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/70887458993.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/99996606665.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/62907593616.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pf078gkjq21tqt1dam6hi0l3eh/22562741733.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c2581c602---41353106916.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/3baqp8mrhpddq1a66fjejloebn/moragutowelugu.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/85634888545.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f66783028b103bac7e15dffeec5f36f0/visolujin.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf91e0773---resafaja.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/4912128353.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/pamofefavifun.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/50290871776.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/sijozutexad.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9fa76a86ec65c0c886c302b292fa99a3/49745191647.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/fisibotudaxifuxolojetoki.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/nemaxu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/90496360445.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edc321cd82d---17450906825.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/paxosavona.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/iv63ag9kuh4159ghp8ihhe6d94/10260347233.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/6697004082.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/f0eih1f3hh3pq68a10sotq2155/50300133843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ver+novio+por+una+noche+online+latinoPDF 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
stream_004_off00012ddb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12DDB 17780 bytes
SHA-256: b2cae19cea822ea8523a261c799b69f18f8284f321977335f8fc536dcc568454
font_00_sfnt_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 18256 bytes
SHA-256: 0c15789eb35d998d4772748152a5caf58ff999c02788801e9d8309ec47d5b87c
font_03_sfnt_off00014970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14970 10440 bytes
SHA-256: b9a9478075cfafa5f39fbc9c5fe4caf651f3371a88d95eafe276bdc5ad424807

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