Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dabe46e5a5f242…

MALICIOUS

PDF

88.0 KB Created: 2021-08-02 22:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6577c67e009ff681b1fcfd8c5b52574c SHA-1: 8cd169bd2b08dece31486eb08f536c23d9190b15 SHA-256: 87dabe46e5a5f24223685f4ade1df0d9fb8644c9a6cd1e1f8dcfe06c6ac4097d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious files, with several URLs pointing to compromised WordPress sites. The document body is heavily obfuscated, but the heuristics suggest lures related to password-protected archives, MFA harvesting, and invoices, all pointing towards a phishing or credential theft attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bbpcosmetics.com/admin/upFiles/2021-8/file/lawagobumifegezejavilizum.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf676c33c3---52433218806.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lisetaboxef.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a1bd45afcfcece4997b6f12d42012692/51363553046.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd0d0c5ab---xitinalilisuzura.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6b1d41ab---xotofitar.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fadb4c347803d1b741b7eb1208626aa8/40965533912.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0949d4e178---xoviwubumaminewibamuk.pdfIn PDF document text
    • http://asustainable.com/global/file/29704876910.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/40946895893.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/85076911430.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/58850907536.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b28f9958ec9d566f863753f424d1c599/71849524919.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f17748115c6---31857543852.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/h5bkm7tnn3gpc5hl6apjvvuucv/55100581343.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/99605588928.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/ximiwesetumoreboniva.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/48035552187.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/vesifamamupuji.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4ffb388927d8f0342084d1ddadebffb/zikamukusonekowazusadokew.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lumonavepebegipomugomelak.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2akfko4hlifpfvd19to8rdhhmj/sesewexizatane.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hflg0mil08l596f7tct0ebu77s/todirideb.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e871c5e8---24505398603.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/xixemiriramimar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+find+my+aadhaar+number+without+enrolmentPDF 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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 17212 bytes
SHA-256: 06dfdf5355ea6afb63fc430e8743d3dc6d58371cdfce782961720494420b5313
font_01_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 10880 bytes
SHA-256: 55bcf9e8221ae481dabfbefd533affaaf252755fd276183a2b4db9a3513ca82e
font_02_sfnt_off0001374e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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