Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0caedc7c32091c9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 08:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e3a890be7adf7e4ec4e0680e2a34a341 SHA-1: a8b4b65632cbe9ea9bf670240103c8b9ad32095e SHA-256: c0caedc7c32091c9141269e825f7b7cbb9fb6f9ef024490392034f5d1d192852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. This structure strongly suggests a link farm designed to phish users or distribute malware. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc6284f48---49065692627.pdf In PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/8944507567.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b36021bb2a5---69114202556.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/rozupilovujiv.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/ravenugixugab.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q3uos1f2vp2dqnhffpsunvpmk4/84295862694.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/leweza.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/75459095564.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/vujupipegu.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/6655305882.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/15402864958.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5460752d6---51813352487.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986b6bbe8f6---62798117959.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e6dcf038---46061720978.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddf950aa3---neniri.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68778975578.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/k5hui5cuqv2ob9sbejjcloongf/rasorujuduzo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d5f84807---ganelareno.pdfIn PDF document text
    • http://2440027.ru/upload/file/tonexudamujorinegizuwewi.pdfIn PDF document text
    • http://93564497.com/userfiles/99056189327.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/fafebenuzuvap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nuevo+testamento+interlineal+pdf+cesar+vidalPDF 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_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 10924 bytes
SHA-256: 7ea408a7fc70f8fbb93e85afbca9c4239879f030f801a1e4afab68b409d5bdbd
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 18040 bytes
SHA-256: 908d39ab6ff14c624cef9e6058cd00e0ae46b01bf1e2a10b3487fccdd6ae6f85

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