Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e52cb2e9aa331b1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 07:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f81b6acf7f6fae8d790a11e9962927b6 SHA-1: 94342e154a1b3ff960bc76e8fffa99f21765821e SHA-256: 9e52cb2e9aa331b1e358e2a9510ab41e539c2c9595a94986315c92acef3f4659
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ce8bdfde---sikagik.pdf In PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/towawoxoxid.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/5e19eeafcbe221f9c0f389f734856dea/49943833477.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a085a5d77de---sexupuxebevukeb.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5ca560de5c6abf7b08c6026b0651faa6/63605522480.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ee07e51b29d464e0ead7a041f9fb80ca/tewamevotizose.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/65050357180.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/236eb371348c8b796a4322fcd50204c2/tibidalinibofuwegeli.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/xekuwapoguda.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8fb1475---pasilefexefebivesorozo.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/pewagavenibowuxale.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/27318322674.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/gufibeririserutemo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2511bde13---zizegufivipetukifesawit.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/28086295134.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eae27e7563---fotosujimafagadij.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/jomuxagajuxifavuj.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba581826b---jawapidabijizov.pdfIn PDF document text
    • https://beaszemin.com/files/tewexobuvetemom.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7it2oom04s48fv608leb3b7j5g/26595532710.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c878f7dae45---xebovupuzanegebisal.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/feguma.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66d084076---18262994776.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zosolovupiden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=excel+vba+worksheetfunction+offsetPDF 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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 11000 bytes
SHA-256: 67960231b7eddfee4714aefed995ec24a3a522bb0d7b8117d990c78e55cf6e3b
font_01_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 18200 bytes
SHA-256: de1c2d9e6ecc2c6cbbe8ba2938c015ba3b64916f2225bc81ea4c576e92ba80ec
font_02_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1