Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eabbae82f2a6d83…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 01:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4607733a1a3857f2bbae7edd4e624971 SHA-1: 969a787bc6df450089f7b798d67e26d45f68809c SHA-256: 8eabbae82f2a6d83dc62c1db41c93df2d5f3588b941043ea7c83a7846131230e
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 0.9972

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 https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ac3bc4b1---xegoz.pdf In PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5c1ade7e8824e67fff5eff5544a53656/42464493429.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/xixozavajod.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/95488712190.pdfIn PDF document text
    • http://championsview.net/userimages/96077665940.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/fumawujute.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/121c6337ecd808222d76a1ea75d11b54/7119703043.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/08d73c65ed8a5a3e12e6aa049836df21/peregisiki.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210831_222601_2613.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/46191352139.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108170022572197.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c886c0a1bc9---43016413288.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc3e826c8---86250541634.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087563f3a64f---26975874350.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607963aa2a2f1---6293235704.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/gukozulozo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610270e5e3f5e---51887529584.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/radaxikakudutasebimekenaz.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f2cro4ko3oq4rtn5ob0nmmqfqk/vimupi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/99c1659b31ce80015dacb2aeab2ba1d4/85033704299.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5d155a0b5---kolunemiwegudonare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=11th+maths+logarithms+pdfPDF 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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 10664 bytes
SHA-256: 8b4895b45430d896f3e33df06e90d05bb6c05eacf571dc632770f4714b95399d
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 20240 bytes
SHA-256: 56599c56ed05e8fbdd8992616dd234f2d6d59711b5cbc861a0f92dfe5f419676
font_02_sfnt_off00013198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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