Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a8f6c26580b7cd…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 10:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ae8b5aa6bf8c5e888316f18b7ffd521 SHA-1: 0bb60c561c7e0be8293d8eafaf996e5cee189863 SHA-256: 43a8f6c26580b7cdd8e5812c5c25cd35618153f8e7c52589e7ed6ce2f840f0ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cmetrix.net/ckfinder/userfiles/files/rizuranutojodiben.pdf In PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/41675222355.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/lelegufusogamuzezajab.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/nadunujomul.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210714_A99041DC7C7A705E.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/775bafd1705b9fa439b315e05b0fd0f4/6260463930.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/vedababozape.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bcef521cfceb51d80a8de6a9dae2b660/mofudolutimiwum.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/72027965241.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609474496729e---60054248290.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/rexepowakuni.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/19029182053.pdfIn PDF document text
    • http://schokobrunnen.com/idata/16604675618.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5908082c---26783029377.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/28637140859.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/2232640015.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tojcm835d0fb62mq8tvqqdm0i4/zimarakubapigotivagij.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/50299349214.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9894b62669---9800256432.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jozorisagitugove.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-28/20210528080734605542.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/1862817665.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/sawuwudapabujejeduna.pdfIn PDF document text
    • http://www.bash.cl/media/file/duvolivimibep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=division+of+fractions+worksheet+tesPDF 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_off0000c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F6 10632 bytes
SHA-256: 427876f6161f9fc57014de92ebeb9053ababfec97a8805efdcc69ac7371777e7
font_01_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16292 bytes
SHA-256: 854973767550005bafd40d1ede275780639ad3d0ba0f18e1df7b777e581cefc4
font_02_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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