Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc50a663273cc37…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 11:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c10c9a306f7d0d4d9a75141875052f9 SHA-1: e8fc58263b00872ff05d5cb5fb3f06d1c7849054 SHA-256: ecc50a663273cc37e80f884649a7035826fd13d6890ca155234ff1da4ebe8df3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of 'cmd.com' in the document text, alongside numerous external URIs, indicates potential exploitation or command execution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://guchen.ru/d/files/89119081237.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a0948d0cc93b752c9005e9a38691f356/50500739767.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/398cd2cb6cbd93208602ca2af3365aa6/25772963455.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/dokaxonusap.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/28632507595.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/mizobuta.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/91164185240.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/wimasologimemigaxomor.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/niwafabenam.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/98982144506.pdfIn PDF document text
    • http://qdcmd.com/data/files/26744910602.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/67596908464.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/guvadotibolizebakifigoti.pdfIn macro / runtime command snippet
    • http://ozdoby-betonowe21.pl/Upload/file/zenufamumux.pdfIn macro / runtime command snippet
    • https://bazk.info/public_htmluploads/file/nugexadujag.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/55946451959.pdfIn PDF document text
    • http://abworder.com/uploads/files/julojuzavenob.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/67291268216.pdfIn PDF document text
    • http://theponghop.com/upload/files/18845949550.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/divujefapozu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/temepenawaraw.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebb5f2f52---277613497.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/37474183069.pdfIn PDF document text
    • http://kleinschaden-experIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=american+grammar+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_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 17516 bytes
SHA-256: 9e7aa923f3ac2671bf9be30be4326260d657b5976b3f3996d956655cc5dfdbe4
font_02_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 10512 bytes
SHA-256: 3e0d288b54faa3eacfe1251524b0dc274938ce4015e19b453e09556f50427feb

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