Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03d8697b1e4cc55…

MALICIOUS

PDF

91.3 KB Created: 2021-09-19 07:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 676e96327b68951e33ebc7e3994336b2 SHA-1: 61953581625b3f4fdf93a936f24d80daf88150a1 SHA-256: c03d8697b1e4cc557e405f39f5c011226199f015595e00902225c3e4fdca8f1a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload via the link farm. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coinproject.com/userfiles/image/file/tirogegaxefexiritibumi.pdf In PDF document text
    • http://tnshoppingbag.com/upfiles/file/59289166160.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/38138427649.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/97629660636.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/dokuladu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6e8c01af---2943296519.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109190252192741.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/11916980030.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/82340655078.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/liwozazolinumalaxaxo.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/bitevoraviluxuj.pdfIn PDF document text
    • https://media-get.com/userfiles/files/mujebebowip.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q4bp0iljiaqlofqafjnl8shd52/dezirosid.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/66528133407.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/xojasa.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/bagumexujevodiw.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/rozebedize.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/muwomudolijojekidapu.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/82265869103.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/50520319185.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/5974286126.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/sadizelutepenubawivavix.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/fanuwikevezufasuvote.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/riwobetemaz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1bbaed5f1---zujiba.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/62576842432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=whatsapp+plus+5PDF 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_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 18460 bytes
SHA-256: fbc9dfbdbede15f310015b72897ea22fba612a80a82d189b4afbe1b432a7e6cb
font_01_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 10028 bytes
SHA-256: 03b34ac6aea68339b5cb651ba87efb1a0f23336697a83b63349f7d3fe79b0ad2
font_02_sfnt_off000147a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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