Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cd60cacf821b12…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 16:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9703bb9d5dbe1d51cf58d226a0221997 SHA-1: 1a303f9535a9ac96cc2a9221034b61b0550429e3 SHA-256: 70cd60cacf821b12d02a1481376d31819b584ed9e3ce53184d508f5ab25f5ede
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://vildmarksjagt.dk/userfiles/file/4144647047.pdf In PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/39247115987.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/85686164538.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zazerezufasagomaxim.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/50143211297.pdfIn PDF document text
    • https://taperagi.com/contents/files/72538085732.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sazos.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/lefujugazizapet.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/92711430061.pdfIn PDF document text
    • http://grimastone.ru/files/20372573039.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/midadesesum.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/dexitidoxiwimikopefita.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/20358279634.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/kudoxat.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/67239136915.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a289f5f3---77866979640.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/munibuwolurezonadaki.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c67419142---volako.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c5cb61eb---botisaromolitipule.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zukegosipanewut.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/66606627887.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/97113245695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hackode+apk+downloadPDF 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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 10216 bytes
SHA-256: dafbfea3ae0bb94db208ca7b8ce73944ce47cf8e2816d9ea3b0cc3cda753b3e6
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 18092 bytes
SHA-256: c1e82001fe1ad77926ec1cbc4442054cbdb04feab36353d84d8314d5820c8c44
font_02_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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