Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daa8c27d7157724…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 16:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dff9e640968339fd4e3ea329a46fcce SHA-1: 22e63c81bfe7f14e160608aa01624c64165f9422 SHA-256: 6daa8c27d7157724c2bfbfcf010efe63463cc71d5949e45eaa5f7e13bd7c5adc
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution scheme. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jv-cms.crazy-jessie.nl/uploads/files/javodipesadaxumomonupop.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/luboziraliz.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/72733074677.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/98849487919.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8e5ea8bf---64272975903.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/61502401284.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/11127322914.pdfIn PDF document text
    • https://masukpt1.com/contents/files/2463174280.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/12857371222.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/96857136010.pdfIn PDF document text
    • http://signauction.net/userfiles/file/miwor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j687totd4g15h8o11hqgav5bqo/58850878446.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/kezugaridunololimosi.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/56252721908.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/jaromewaxadiduribopapuf.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/niludawululezurepinawex.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dffc678f8a9ee9a2b9ba082cca8f1061/30657965488.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73349699245.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/36185987222.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7bfe373c0---60652641686.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/tifiwado.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/birodizojiwasawixu.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109100127466550.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/sofizowumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+birthmark+story+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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 18028 bytes
SHA-256: de451afbefd48565af2c62dcfd29ad5e71e9509c1afee4f0afab092ebc60eeee
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 10924 bytes
SHA-256: 2c2f07b0111ed90d088da907bca65afb2e216c4f930ac3f4a2da42b0f4119d01
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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