Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bc6a3ebb864334…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 02:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74424addb3c5393c5f2e6a0a86ad73b3 SHA-1: 090519e3a8646fbde3b28a0d23364b27b6c165f8 SHA-256: d3bc6a3ebb864334b33790a2fdd925ec7dcce64d113504d16ae8d941daa2529f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous URLs, many hosted on WordPress sites with form upload plugins, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chasehr.in/userfiles/file/54018037107.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5cacae711e9e817107c1a2abe8fd2afc/64550141657.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af192c4c3e---47659694885.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vuferujaxigafo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2028bb00---zemixepin.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/josupo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b2e189e7b---kazobezaz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54afba9b1---86523824868.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a8bb3fe83f88615e0ebb7abdc1584a14/nezelabaluvosibizobuget.pdfIn PDF document text
    • http://deauville.ru/files/file/lidobinepaxoxufevuvowuj.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/pexejadijebujomumukasaf.pdfIn PDF document text
    • https://codecs.roimages/file/882421678.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e71dce82a---vuwolaz.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/13072294614.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de2a0d463---15487142206.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/dajigisilepotefodifo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a89203f1ed6d65e09aa7ae985e86ca53/77479633677.pdfIn PDF document text
    • http://armanetti.com/images/20603485845.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ziroger.pdfIn PDF document text
    • http://195exim.com/datas/files/witefukadav.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/37033093147.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/nafelediresexu.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/tugomon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=zonedirector+1100+manual+espa%C3%B1olPDF 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_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 18512 bytes
SHA-256: 28c66572724a3f56c928445e4d17125fec4fc189bc90ebbcb96ebf51c71d9bd6
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 11120 bytes
SHA-256: 5936694858bfb0f82aa6d58643f68b5fd4985a34395dc7c9ff4612ed7865663a

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