Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab2215ad00b50ee…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 05:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08969bc81ab371e5998844186d0aa296 SHA-1: 4cee2f435a34a392777d5b9ca933b358c0ba27f1 SHA-256: 4ab2215ad00b50eed70079b986b88ef43f801f3b7e8abda61c9d23d11840917a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://malir-naterac.info/UserFiles/File/redajenuximapav.pdf In PDF document text
    • http://dexgerm.com/data/file/userfiles/files/zegevowasemed.pdfIn PDF document text
    • http://nincity.de/inline/file/penotakumupulefoladuwiv.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/gurawipuviribuweluz.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/pinidow.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f7d72dad290847872f1448d061dc46a2/widoxodi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d28e06c3---vodokapegamateponigupadig.pdfIn PDF document text
    • https://superpart.com/files/nigovedugipazakewazakanil.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8e2181a99afa5f7505838862b33db6bf/93132384856.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/7676982522.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/11828017040.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143e8d556143---61965926416.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/40841494119.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/91396291556.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/20824367810.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210917095606333602x09m2i.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pepas.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/dazulujeriwogakironun.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/18735626337.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/36744072114.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wevejorefevenej.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67325008283.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/gijuwimubuliwo.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/sarelitudu.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zilizijawosamuxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=find+deleted+texts+androidPDF 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_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 17948 bytes
SHA-256: b0d90e238694fef5a4f4d0051a4a11cd14e3eac2f2ae00999de2d7e1b03e7cd6
font_01_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 10320 bytes
SHA-256: 125618abd53afb3b8e6c6dd394d8c5f34486bc30abf383ed614ff08e3e6d08cd
font_02_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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