Malicious PDF — malware analysis report

Static analysis result for SHA-256 d308a0b42a305ef5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 21:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e97fb068cc1d1e9a250bd71349ee0270 SHA-1: 3c9263441bdd02a831091812f3769a603e9116d6 SHA-256: d308a0b42a305ef5fc08152633ff4c0de0fd8d5213fcec3fa42f12fcad07f27f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to numerous distinct hosts, some of which appear to be compromised CMS uploads, further supports a phishing or malware distribution vector. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://akcjonariusz.com/UserFiles/file/wodorevodedofejopokaxive.pdf In PDF document text
    • http://envigest.cz/upload/file/23484310078.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/87576969049.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/186462ead46fa4665cf6248b123f7566/xekewavosevu.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/19969435155.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/65458331742.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adad1401630---gojom.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/22463508359.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073606ca89ea---mapivuwitomamiwulomepusew.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/61379516658.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfceda013---reforavagajasinavonut.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/nunidaduwurizopos.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/26941205661.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/zivuzegusotivinule.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/n12gutpb6gu46ue8cg79dpi9bj/81299567545.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/mumujurazoxaxajisugusulax.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/84751440832.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/87785680931.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e6de5f1cu4mak2nipl6cm5b4r/49707293619.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/pamuzuviteramekadumugis.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/rilebaroxixugikolej.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f00f5769d019b0db1e135a7c67fd1f11/genud.pdfIn PDF document text
    • https://dm288.rs/slicice/file/15136298997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chapter+16+dna+replication+worksheetPDF 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_off0000bba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 11040 bytes
SHA-256: 394e029084c41c3bf9e5b9b883644e01a9d5b8fc3502441927dcdda73e19ea5e
font_02_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 15672 bytes
SHA-256: 624778249fbfdd43c27d681ce16feb5b18d9c9f22ab5276839ca47e0355f22e2

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