Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd74e966147bb97a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 00:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b646296a026c5a821d03a02e050c3c2e SHA-1: 74f00301180f3be26509b101508b7e57dcfb8bbb SHA-256: dd74e966147bb97a5a761a130f6670f17df52f2afc9e0ad66c03dcc72dca786e
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 0.9827

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc25541a3c---jeverowa.pdf In PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/70797970323.pdfIn PDF document text
    • http://kgmda.com/upload/files/47996921092.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/susoxabopapurowaxalaj.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/16946794986.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108202358049248.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/samunixilizol.pdfIn PDF document text
    • http://beateromer.com/bilder/file/suzokefosalugusik.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de02da13ba7---79812545372.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210819032742.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/10484317048.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/26292653239.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jezupuxar.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7dbrd3pvjg5i4bec1nvdg645b3/48932949427.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/58908915758.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/55854661379.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/69347593174.pdfIn PDF document text
    • http://geotersrl.it/file/xovulapajud.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/alv562ql498ql0vspjidbl01ga/puxefesazafemitukisikura.pdfIn PDF document text
    • https://domilot.com/uploader/files/musagataxifep.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kusuzagokedezi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c136d4389e8---32628074809.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905231825.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5f7d409d6db172b7de3c15a1da88cc03/godenofunosaxijoxox.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/dinejemukepelob.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54899690738.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e3d3b5e503ad03ed718c7adef12f7948/89711987368.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/3582979548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdf+resize+up+to+100+kbPDF 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_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 17420 bytes
SHA-256: 479561ba430d46df95e90982ff8043348e3f3c24b031aba52dfe75c95e89a654
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 10748 bytes
SHA-256: 8203596b015755f64a242da8ee935346a888e2920e635dec8213a9b968c3ab3b