Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b6ef94daabacde…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 05:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7018219e75398c670588632c2736f82a SHA-1: 90f307d759be15b4c37f368532e76e9b69fb3d45 SHA-256: 06b6ef94daabacdebcbbcdab3adc6ccb44c3a8d7c1be7bd2f52654047d8e81ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://modellszerviz.hu/userfiles/file/93681980248.pdf In PDF document text
    • http://praguetransfer.com/files/file/76332294406.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227c70466c---10819165594.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab29468b6c---leseboveluf.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rurituwekarelokadomewe.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/wilaxafukoviromosim.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/91474787833.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/mavaziwikisipitagukixobul.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b40b9658d2365511fcec30eb597dfb85/lunaxegozuwowawitigerelov.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/49dc91c8c9da74923e17ca5cb6dc7c59/76739684248.pdfIn PDF document text
    • http://healthywithhart.com/res/file/vevubomafalivanomivu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/56054447819.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tfcnp6frr5nd1n0ph75j3ismc6/wapetesiwuxugitexazofezi.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/fiwojezofimimep.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc25cc7783---tavasem.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/88a8e0fef051421c54d88ceafba478ad/4712502882.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/25176927204.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/asoan3c7kb2s01uimkdk88cil7/surusisedoni.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/40716102226.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/95159312296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nsfas+application+form+2020+pdf+download+nwuPDF 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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 18296 bytes
SHA-256: d6bf1df134f63e00e205d2f2746d40a94a322349b07d5fdef0445dba0eb4a140
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 11056 bytes
SHA-256: 8b6f26d37bad39588e4951767a9a9cd1f00856b145ef63b93cf941d865e4c73f
font_02_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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