Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc52ef2d038a525…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 05:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1397cbf20f4a44dbee5fe1bfba83739 SHA-1: 510d423267a37830d4cf1eaea353c33bc71b8c8f SHA-256: 4bc52ef2d038a525ed1d6966bf526b46232125a6bbf15dcf898f556704036705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://discus-rus.ru/upl/file/nujazukuvalepepeporakipu.pdf In PDF document text
    • https://adasms.fr/userfiles/file/didudanigifojusu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608901cc4d783---48940836930.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/11548395620.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/73660438359.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/62652127115.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/ravuruwudemofus.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/11813405212.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/lilitabakulatebum.pdfIn PDF document text
    • https://olterus.org/contents//files/4889047863.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ad4b7de11e09877b83819a9aec3a33c/ruzavivon.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5bmuodk72f0bpr8vghrvs9198m/20378904019.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16084dec349e63---74569390042.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/darewagufumosifesaz.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/15783389984.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4297d0a4225c32a27603ed616403032b/20840684854.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/duzujiwiwumomokege.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/fitumawezemadap.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a5055aa19---wusizekileva.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073152e39521---93540116601.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/wiwawewenolokoruxig.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/bozojobikokukowogi.pdfIn PDF document text
    • http://maidichike.com/upload/files/dibewarexojovomapujigikob.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/fitadegasevoraba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=all+the+sacraments+of+the+catholic+churchPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2cb87902c342e6ffd94f02359814ff11/fosanubirevomopawebixave.pdfIn PDF document text
    • 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_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 17880 bytes
SHA-256: cff3950761e73896111d4e073859bfae98a7c19df1c5d23eafe36caccbcfacbe
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 10680 bytes
SHA-256: bcc16635936ca28f740dbc35c56aef3e17bf6de5853761e241ef4f0ada5f0dac
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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