Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45be8ffa8e1886a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 02:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0557a903471da996da435c1f65c5faa2 SHA-1: 15d56d73f39ba73599968ea38137c8f40a609864 SHA-256: a45be8ffa8e1886a6de1b5e639b154b31eafe9dce03c043e22e0ce4b26750294
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, as suggested by the PDF_JS heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=gallery+installer+apk PDF link annotation
    • http://imoroz.by/upload/file/nukifiguxofamaw.pdfIn PDF document text
    • http://castel.lu/userfiles/files/sifasozukovut.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/24555621243.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/tosigisolebokolemilefanem.pdfIn PDF document text
    • http://juha.be/_files/file/52452454099.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/wemipofufenunigubojex.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/defevukosuzader.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/mabegotevixezore.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613996d480b7e---62206404585.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/93759648306.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dde7ad124179fff6c48e72a7a5d0e2aa/14370751766.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/kudedased.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/59101400170.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/xirokoredaboguwikibemaku.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/62680096632.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/72229213115.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/6232383220.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/96779120657.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/menepokabusa.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/lekupalupakinopumuzagi.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/sirabetimepapateju.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/81918530284.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/45486457584.pdfIn PDF document text
    • http://futboltotal.net/images/files/26070159051.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7c964d45---refanof.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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 19904 bytes
SHA-256: 786d2faca2f4d6a08087eea29e7bd41255972e9ad945b2b2ab195a33d457b2b4
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 10372 bytes
SHA-256: b7d9c288ab168dd08ff4025091cccf93676f3fcb6570570aaa0e959582d00139

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