Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd935d02befcffbb…

MALICIOUS

PDF

110.9 KB Created: 2021-09-03 08:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46844a1caef4befc4c2fd3a152824484 SHA-1: f7b2e20cbcfddf93714193d64ef4a3711544f89f SHA-256: fd935d02befcffbbc1fec2fa2c15a11c7a1f7d4c4c45062f7847cf98a26abe9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the final malicious destination. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • 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 http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075111fb1abf---wirudipap.pdf In PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lixebe.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/545fdc05c4b09a3f32b95d24a282baba/42322839144.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/91628206972.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/jolakes.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/57273174575.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e15c0ab2f7f3b7b21e0d015c1cd32112/menixuwobiridewize.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7493ae65c5---pukujufisubujuz.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160767b54a48f8---73605464319.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073224a24de4---deneradarevijilukag.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a860d4194b3fbe4e1afbb568c29002f8/17066259376.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c8f9ed172---sevesomogejobasozajox.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a0ff2c414---39248100531.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fejudivegubifibafaxisuz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acc78319828---kefofoxutovafigidaloduva.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/wezufulokawo.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/xebofubosujere.pdfIn PDF document text
    • https://khanikango.in/file/79692736270.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/gufozizejokuzetudomizonu.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/64374292446.pdfIn PDF document text
    • http://come2menorca.com/images/file/xefegelinowogulikizopub.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/2da982c2392f88e541dfd220839902c0/tevaviponujew.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/supivimagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=supply+chain+management+processes+partnerships+performance+3rd+edition+pdfPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/79009520296.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_off0001455b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 20124 bytes
SHA-256: d7b351323ed99f0d19797a17608741edf8f2a626dad30692c57b3a4d6f121ae8
font_01_sfnt_off000179e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E6 11528 bytes
SHA-256: b5378adb5455a7b029e64fe4f5c77116d21ec2f2f800c10ddbf15189d49deddd
font_02_sfnt_off000194db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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