Malicious PDF — malware analysis report

Static analysis result for SHA-256 869f917fbd9394d6…

MALICIOUS

PDF

81.1 KB Created: 2021-08-16 09:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4d35c2b2f7c265e375befddfea9608e7 SHA-1: dbc7562f9bd883e0c31973826848a880e96dd9f0 SHA-256: 869f917fbd9394d602b586e70b742b08b450c7936593ea8fdb556e938a6eccfb
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised CMS upload locations and disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dzbnf.com/upload/file///zewababekejale.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c01d7b07---gojigozogamosaxurigudokur.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160e781be461ca---rasifa.pdfIn PDF document text
    • http://laduses.nl/image/file/ragefige.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/20880102651.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/tewejawofutuluvo.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/riwug.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e5099054f60542fbe00233f5d161fc8c/83622011683.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/82018930765.pdfIn PDF document text
    • https://viehomes.com/upload/files/borujuzoxiledipupaxe.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/xadexe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa029073a98---52864529702.pdfIn PDF document text
    • http://soupworld.de/upload/file/pexipukapoxafumulesoga.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/kupadagimefopajuwofiluze.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/98456944396.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d07788cd---58610557665.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ggoel8abu1k84sh58imp874t2f/62526826802.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608143dd6ae9b---texufogorowivepazazomifim.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/kojumugigadiwazojakew.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/pezejovuwawudadadad.pdfIn PDF document text
    • http://goref.ru/files/file/98032219769.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/47655085247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ordenar+palabras+en+ingles+desordenadas+onlinePDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 17500 bytes
SHA-256: 28fce5fcbe451ba78fc6b7c05d7f99d5ca592709b9f747e7ff3f6b087745a42b
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10632 bytes
SHA-256: e4245f18980b4996c6c42354c32be17549f8edca3b42867518f3a589f2081ecf
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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