Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba03bccf5cab2da2…

MALICIOUS

PDF

86.8 KB Created: 2021-10-14 05:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e213843a5d7feac980ea07da1e29d67 SHA-1: 31551472a5a5b8bcf200a9f41358f178f7dd20f3 SHA-256: ba03bccf5cab2da293390e8eb2119767ae9c1c18969094addfbb2b0b7329bc05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://sparkpro.lv/content/file/zisoxanutufafevimetaf.pdf In PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/vegugotupajixag.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512e1a3d415---45907062386.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/dowiwotawedoridogowetu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d59631c38---81189398017.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/5430209571.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/89378696363.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wisudusuzifeloxunipowev.pdfIn PDF document text
    • https://langumeistras.lt/i/File/vutowafafuke.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/9612396753.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/musegixesa.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/46136772782.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/dajuzatajudetokodir.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xoworafigokapi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/mudetotujovupizawixal.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/36658519054.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/jiwanibesenelodavinusoneb.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021100222261543.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/fimujizafenenu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tl5cqfv9setc1ns2fvlbsvaklk/67915505877.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210919_011623_198.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/15258999502.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/turexu.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/tigiruzodeludedolulewa.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/wanuraguvigogugima.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/mitasose.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=best+quotes+heart+touchingPDF 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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 18940 bytes
SHA-256: 3d72250d45b153f1bfde8a76a03b4296cdc7e3ba23033f001cd75fb51aa504dd
font_01_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001351c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351C 10764 bytes
SHA-256: 6724e1e8e9fab50cb7741efa10216a583ea00e78c6426430c6d2de23e282ab26

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