Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb343f4633b9a60…

MALICIOUS

PDF

87.0 KB Created: 2021-09-03 16:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 784945fe545d9535fd041f8084a1b80e SHA-1: 33752c4a15c18a253cb0419d5d3d6ab875d3e4be SHA-256: 2fb343f4633b9a6071e7b034963f66d781ee59e4bdbc48d46406b16dc30d373a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS uploads and disposable hosting sites, likely to distribute further malware or conduct phishing. The embedded URLs, such as http://cachnhietcacham.vn/Images_upload/files/waredexogiwip.pdf, are key indicators of this malicious redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cachnhietcacham.vn/Images_upload/files/waredexogiwip.pdf In PDF document text
    • http://yjsyrj.com/userfiles/file/7129053739.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/turadamemosilobumi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7556d726596d0da75342ef48586b335b/vipuxaxemuxivomopunem.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/949lm1ld1172sv9aablhp4ohbt/58387990706.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4cfc7893---robeketifomipawosabosiku.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/kaduziwojudululajomuxesi.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/74276100651.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/mozelatadovowuseza.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jugevijijejixixuz.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/9637242334.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/ruzakax.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/3455346135.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbadbfc98---79735201606.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d17f8b26f---muzusisisepeguve.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/13565697060.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/77941879367.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b4f0284f---55986688914.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/ponit.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec0d088b1---75443226205.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/sazobibafevarisekugemi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e1bccef8---77174716558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=purely+functional+data+structures+pdf+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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 18972 bytes
SHA-256: afe0ee21d7403eb06b818a894ea9ff8287d671c043746711d51c72166a5a3c35
font_01_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 10912 bytes
SHA-256: b9595f5249330a09a13be13b8f13eaff3e49fcb0a693ce1730d4fcf90bd47150

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