Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21c09a889043021…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 10:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bb8588be9a92b1e7f4d75369f4676a7e SHA-1: 89beb04f1afbafe2d08a064eccf16c1c4340a912 SHA-256: d21c09a889043021a800ecbcd6e9985dbea672bf43660bbccccadcc42328bd44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=mapa+offline+na+androida PDF link annotation
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/banuwidu.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210909/16311596964687.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/429668809613168a95ec09.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/letigalezanalimupitujosa.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/25726815232.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210906/210906184543685282fmf0iw741yy9.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613509c517c6b---92031442070.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/21358180471.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/fogevoler.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/80508837539.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/nowiderikatexubolili.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/99mi5tifuauc21a5o2d8cp9i24/zedapenewalefumekizasor.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/sajabunijuw.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/zifejufew.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34982668436.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/gizakobaforukenojazig.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/lilubim.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/xawalapirexemesafulome.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f9560d15---42282477840.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/peminekanixiwujavobin.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sizabosuv.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/51363750172.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/givegizokovepetigajeno.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tqt7psfvum2ouv2ji76284lbr4/72371151219.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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 20964 bytes
SHA-256: ad0e8441100bc54992ddf61fdc6c0d7276d4f91b17ddd68579f93f05e8441df9
font_01_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 10216 bytes
SHA-256: ed9275e43d2eaf978e5e5610cd00de66f331bb2f866836e6c1430ad984b34185
font_02_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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