Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc6589703e0ab6b…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 05:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07bb7c44fa42e493bfc149ff71cedce6 SHA-1: 4dcd4fc178e495e6a7ab4e16cc9fc0a7be808531 SHA-256: 8cc6589703e0ab6bf010cb47a227fd472251f5c82044117e686ef3096a50d0b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

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://fli.edu.mn/ckfinder/userfiles/files/2834586070.pdf In PDF document text
    • http://jawarakreasi.com/file/matunawuwasabidipufepaza.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0dff1d0e2---85835997873.pdfIn PDF document text
    • http://hgindustrial.eu/userfiles/files/mamedopirudex.pdfIn PDF document text
    • http://mweb.cz/images/file/10930513227.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2321d6a8---rurozelekepuxojavo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/1420954663.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/wakuvojafod.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gixafogixufisow.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9881c43e1---23517035560.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091220115180554.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/42895859007.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d938443033e7f9d9e9895cfcc7664b87/61307305463.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/13879327883.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/74781661816.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/panorapekewazusijuzufapet.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/turexekenubifegixowo.pdfIn PDF document text
    • http://ccsl.asia/files/91774166746.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/54745036762.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/28642291397.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614527e363ff3---80375926422.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/numetuvosudire.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/86546404209.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/sokir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fat+in+chickenPDF 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_off0000b01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 14576 bytes
SHA-256: f9eea56c03a9d33496f227746c901551f7546d38d081febde15af9f2b6590dc2
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 9960 bytes
SHA-256: ea8932813f714912ea8e9982f556a6f1d28674a61ee4e04a1e2414c2044ea2fc

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