Malicious PDF — malware analysis report

Static analysis result for SHA-256 d870219f52031f60…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 08:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a03f3353cd39caedace28fda405e0593 SHA-1: 9c7b6124dff05735d8c40977d458282850998c27 SHA-256: d870219f52031f60504d3bab5f402a1cc4b7f10e5a181e56a9dd4e9a1d05bcb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=electricidad+harry+mileaf+pdf PDF link annotation
    • http://bright-mineral.com/uploadfile/file/2021090600045052.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161354954b9640---runazamudo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614322699bc83---3248540508.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/73453220400.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/kisonitugap.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe2d6eb1d---79672070046.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/tidatovobas.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/30bra2ktdt0oltsqndq1eh0gs1/70493390598.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/63640404268.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/gefogopaxa.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/26931475678.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xeketilipimodatezenagigod.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/26693488732.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/xukopuzimolepa.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42135955981.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/7051545923.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/71734016954.pdfIn PDF document text
    • http://chamdure.com/DATA/files/lubaribizofemidenafiped.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/98836170009.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dirazorer.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/narikalefezuzeze.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/filiparam.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/65198409099.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/17818809089.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6047ba0c---gidotonemesokar.pdfIn PDF document text
    • 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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 18580 bytes
SHA-256: dc2b80bc92ff6a7215f61b600470d77f30b292574af53bda14f955efe0f42d8d
font_01_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 10592 bytes
SHA-256: cdac65582c3047be6a0021df9590c53e31ea3b4372ce460348e7917b57448ec4

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