Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebc1fa56888ca6f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 14:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f000da22794626ecd0bcbb866035c3db SHA-1: b8bb1d1b0d3854d83d86f43638e59cef509242dc SHA-256: eebc1fa56888ca6fc91fe173ee4087bf5185ec3860ade100fab2c4c8656a66c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm heuristics indicates a deliberate effort to redirect users to external resources.

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://seventyfirstclassof69.com/clients/60772/File/64918747844.pdf In PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/rodopolinode.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/refarowabijaxadagujoxura.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/73929280202.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mg3br11s0s4jiqkng8vrjguveb/68136226553.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/wuwifupemu.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/10240086362.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/jajogigujomumewanuravaz.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/22186235823.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/texigalufazerisugute.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tudoneridosikeza.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79c3657b9---23339620892.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2b595b785fd1b466673f417d323a6b8b/vugokofepezoxepele.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8021b9c6---14882966355.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868d45cf884---70337939492.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/68052511175.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/gefefediwamoxirexugodet.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161193af27a644---72062766718.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/16981468351.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36905ee340---83197428886.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c7267b32---86412415665.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/xogogefozuviduxefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=balance+training+exercises+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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 10828 bytes
SHA-256: 185af35098e4d991098cad757c6932eaff8a86b4b20fc5cbc1d0614eca697652
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 17808 bytes
SHA-256: 4b6c961ba16c3f6086e7443f021dc0a5e90d569af240994dcb9978a4b118520a
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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