Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4a964a2330b0f0…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 21:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5850499723404f3bdb2d27bce0b5693a SHA-1: 461002f1acb196b55e8fd4f5f6f5d61bca661010 SHA-256: 6e4a964a2330b0f02fefe11ca5060ba94d31da0e44f1ac67a18b6b2d09502228
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://www.aluvascientific.com/UserFiles/file/dojumulozupokinume.pdf In PDF document text
    • http://douzonebnf.com/upload/file///97201457482.pdfIn PDF document text
    • http://caramelitos.sk/files/xedutugupewo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad6b280a6---99990326116.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48263e812---vibirosukugiduma.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/gokonufes.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/98644969fbaeabbfb6c310c7e1dfe8ca/dinagobapixodufirobiti.pdfIn PDF document text
    • https://andrejc.si/files/file/35320561457.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/v3t0fbq1e218rt7qnpig205dh2/vebepataxikoseludiwavimej.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094372190864---liboditikufasavofipitaku.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/4202305761.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fb4bc473---91765818065.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd87d3a57d---fosuwepezugoragewarat.pdfIn PDF document text
    • https://activepymes.com/pub/file/kajunuzogusamuded.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/50965880843.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fbsbnlhhdgvs0g5aktfop57u7o/23422456853.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/batiwukukepowad.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/verorogivoduxamitanule.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1d8bbcf235988816acc290765d1e3fbc/15196735101.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0b1db42c---moberuwabugowewanejinuti.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a2697e6526413bcc0d70a758bdb35a20/dupatinuna.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/timewalepubir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+cite+when+paraphrasingPDF 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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 17688 bytes
SHA-256: 23937f83b92f841bea59585cf9985c89bebaa63a2e0b660181456cfcca125fc8
font_01_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 10684 bytes
SHA-256: ac11dc625a015dbe7a2b49e9392b1c15c01ca458c5e2034e35bc96629ea72047
font_02_sfnt_off0001330b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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