Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc3aadb25ede657…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 11:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 966e6004d2c48de798fedda4eec70ca0 SHA-1: eeed3a98395e9e157b4895b8de2e6266409c8aec SHA-256: 7dc3aadb25ede657f85b5a5b6979fe366b47671533d1a57de9e4be264bb68c54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to link farms on disposable hosting, disguised as a download for 'PUBG'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=download+pubg+obb+apk PDF link annotation
    • http://3e-recycling.ru/app/webroot/filesfiles/lerezi.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/ribigepegenibeduz.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/74918438902.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/38934788653.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/75001967384.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23dac0e3d---joforo.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/tifigidobekunofon.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/zurorilapagiti.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/segepositenaju.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6828d1bb---sekawogudiseku.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/31527977136.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155bf82a7c---37735271545.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/liranexagabisonu.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/70299436875.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/35809146752.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xekanuduxepuxerarul.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zikunonexib.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/vowurodulu.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/27052797270.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/28434939007.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/dapijimawurowagiwi.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/95872145724.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/sezefudi.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/28277055414.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_off0000c15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15A 10396 bytes
SHA-256: c61c09b4852c8430f489f106ff085202aa6fc2d2cb6450433abbb29373a5a306
font_01_sfnt_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 17824 bytes
SHA-256: b917f343d614c89186c5d333da8e9bf40c948200af32be10fcceaf0779c396fb

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