Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32859af995d6314…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 04:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78ac22513430ba19b4b6cbe5f7be71aa SHA-1: e9c3b7388ae7c1bc98dcf26af0b88a69f1dd4a71 SHA-256: d32859af995d631432ca74532cc70093f0f04079aacd578badf4492cf36fa8a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=allwinner+t3+p3+mcu+update PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140290672694---66046002292.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/xazovirojizas.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/950141374.pdfIn PDF document text
    • https://fultoys.com/userfiles/xejigalovemusalevepi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906062718.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/xubanogafapuwaba.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/xemozewafogariditemexe.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/21800803392.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/risesidolu.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/72983087697.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/7222053669.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/67482881349.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/jolukorawo.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/1851063169.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/lipaku.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/95295916948.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3e453f6d---puxone.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/17510558141.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303bff78f06---zamatemupamepuxigosabo.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/viwoxunazododusaxobupefot.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/meminoramuxav.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/pewusokusafuzazigufogo.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/62637291952.pdfIn PDF document text
    • http://podarox.ru/public/files/bovute.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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 17180 bytes
SHA-256: 6e1784b52bf394ae0bd2ecc9dcf9b3f9ff309ed1201cc174d1470a8be9c41d94
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10724 bytes
SHA-256: 33aad612f8d9a7be8c10f4ba87a5194ea45d3da44aa393b7f97c7b31df972680
font_02_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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