Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6bcb49e06d017f…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 19:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ba531e090aa0a61bf79ff4dd3c820b6d SHA-1: 80da0b566b431e7f11b611476b0c5aa38c9d9ea6 SHA-256: ea6bcb49e06d017f994fa6470c864354709b7e151f1eeddd8628193135f9b6f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing campaign aiming to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://inwebjor.ru/uplcv?utm_term=remove+pop+up+ads+chrome+android PDF link annotation
    • http://didongsinhvien.com/upload/files/95703968704.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210909075044.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/bukafamixo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/jojubuvexozoxanaxa.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/4820796310.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c968edd590---dugomijinipovazux.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/pibojogizapesotosipefudip.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/duvikok.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/478637d43572a7e5597af42fc28cc4ae/16888643684.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kegegex.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xawepivujani.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/dubadoxolelome.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/78155132918.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/nixorokixelazugefozona.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/96518905371.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210913180737.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/89446320626.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/zokazivafolurososuluw.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/53901233332.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/97346287614.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161313c42a3565---rokakirosusuvozozimopir.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/butod.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/vefewigax.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/tulofesuzigopinoja.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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 10844 bytes
SHA-256: 455e29aacacb5ff8c25bafd91c05bfe4f3b9fc4ca7c478fd527b3f5b603959fc
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 18300 bytes
SHA-256: d6800830bf858c638fffce0b6644ab4506a58de1197f8de7966066a0aab245a9

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