Malicious PDF — malware analysis report

Static analysis result for SHA-256 d536ba35fe42f3a1…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 13:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80acf38d900586676220bf8ba2cb737d SHA-1: 4c0518e0a76fbc350558aeb16f467cafbe8f3968 SHA-256: d536ba35fe42f3a1d64c332fb993c6f969dfaea8374956030570622ab010d694
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pelejas.com/IMAGENS/CKFINDER/files/16388914279.pdf In PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/nexavu.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/watawarujujidigab.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/80389681974.pdfIn PDF document text
    • http://vucert.vn/uploads/files/59640300717.pdfIn PDF document text
    • https://jjpremiers.com/files/74594500550.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/nojibak.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/vubemove.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/lusufikekonuzi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142f8af24f52---mipopuvefasome.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/30304697306.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd2f544c5---49916917528.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/38668045710.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/4212528830.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/rimonaxiseviwud.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/57528990945.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/dedinulatutuwifelu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b000367717---najifivitiwuf.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69684621869.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b1392f49---magizifuzokirewod.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109061331557246.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/debokupofikijanagoden.pdfIn PDF document text
    • http://scarpatti.com/files/60601864240.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/rariwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fate+of+furious+watch+onlinePDF 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_off0000b135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 16604 bytes
SHA-256: f7377b69020dd36305bef5da3a25273a9030ae17bc5f739d919ca98fae2c2591
font_02_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 10596 bytes
SHA-256: 37f9b81089603ada3524b977d2887fb99a6229c935937c44a82411c324cf8d86

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