Malicious PDF — malware analysis report

Static analysis result for SHA-256 358f0fce92766aa6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 13:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30ea6f708b11445fc82e22eb4b5e38f1 SHA-1: 5ce0e31c8c5e43bc214ba5bd16c6b962b99a0808 SHA-256: 358f0fce92766aa6e1ca7942bcaa98ddbe32f5ec373d3514a399f6ccb8b22707
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=computer+science+9th+class+book+in+english+medium+pdf+2020 PDF link annotation
    • http://xingzhongjing.com/userfiles/file/20210914090943_141057004.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2836d03a02f15ddb9632c31b4390edfa/51811921376.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/benisufinivepefimasota.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/80200134570.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/kanetirijorikolonivawisub.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613558f0b367c---82939172146.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rijadexexezojegaxuniv.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/fureraxowufejexi.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/gosejo.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/5795322833.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/340279188.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lcbjao5a71ape1rp4t2qt1m5s5/lixifaxevolajuzemunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133b0d53e3---85030837979.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/nojupivu.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/numilapotititalowol.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/85653861115.pdfIn PDF document text
    • http://primaneighbors.com/userimages/74957360503.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/mizawopore.pdfIn PDF document text
    • http://beta-rc.com/upload/files/vajuwikolozunozug.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/88408051867.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/4012973091.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/zuvawowalaw.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/lalol.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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 18044 bytes
SHA-256: c33275f1ef3f155ff09ef3689681c0c3cc8e11e3cfa3993443e8932e9881455e
font_01_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 11840 bytes
SHA-256: 1eb563e3e85424cdd628c8852b328b7a7c81368ec36880a85c73a35953d74602

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