Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27a01a3ce9ed147…

MALICIOUS

PDF

88.7 KB Created: 2021-08-13 23:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fae7ba786660eec1f8bae5cc76d345a4 SHA-1: 288f75d799c0ecb0a6aadfbc5ef1d5ac36b6f4b9 SHA-256: a27a01a3ce9ed14781da3799e2e5dafe38f08af3f11bbf99ee6ea4b477e1365f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites hosting PDF files. Heuristics indicate it acts as a lure for browser extension installation or callback phishing. The embedded JavaScript likely facilitates the execution of malicious actions, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608807595561f---piloxazejap.pdf In PDF document text
    • https://weyergans-hcc.lv/userfiles/file/76569669119.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9cbb95080ff7850b28654e777157ad8a/16005904495.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/62ac8f6d56aa79f48681d7c862e8c7bc/widobanij.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/58722463260.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/tazonuxuxuzivebeleko.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/sepezavetovagilol.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb641b53---balumevenolumikusepaf.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bb774583ece111d003e9d9754eb39cb0/vikoteguve.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/a4iekhpfjh1mfl6iocsccfag01/98639249204.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/debc7f4aa3aa2ea81ed2c695a41b8759/zetupemiv.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/sobedavuvonugeseguvekolav.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c240f480418---jetitexafisagizikezuji.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/foppj97hes24vt18cdblhq3dj5/21530301703.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0u94dem7rkou45dfe1moep98od/96237019648.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe0a3ba8c---lomewezaxinunesox.pdfIn PDF document text
    • http://ledson.ru/upload_picture/90681141348.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/p0bjr2ft97durgrbfirj6fttj4/tixezud.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/gibotajenujapuned.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i6jb0g1i2ojpfh05l9bp0l7ql2/40084778517.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1a8b5d403fba8b15a509b38bdd1e0b6b/zuzutegobazinebowokape.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/wakotuvu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/18743603708.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ika3312krfoljvbo8vjm2f0a2d/takipujirolovilulesepe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/30392567547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2015+volkswagen+passat+repair+manualPDF 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_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 11272 bytes
SHA-256: c267ff349e7e9d22240c726d45ad4402ff4a30e81a8d32f45b36a0822bca6276
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 18236 bytes
SHA-256: 7d85d6e1008101aea9910f86c8296aa82fe63b82d745c77e71a424c63768b500
font_02_sfnt_off00013cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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