Malicious PDF — malware analysis report

Static analysis result for SHA-256 524cb83283eb7f1f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 22:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a4a13e652917be294c23290be8f0121 SHA-1: aa43ab5a5b3a1a8d184cf1afc82c90de4d6447db SHA-256: 524cb83283eb7f1fb9a167d7dabfcd6cbc71df6d9ae6fd2316bc787e2dd56686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://razaviota.ir/basefile/razaviotair/files/89300961591.pdf In PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/noxagovilukotaz.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/nisuwenavil.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/58287988547.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b267b6dd5---42529196110.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sebapobosupurepudinekaw.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/94697188873.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/bazon.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/levepirenefekotup.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/lonepeja.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109111633109225.pdfIn PDF document text
    • https://interconformity.ro/images/file/6711464363.pdfIn PDF document text
    • http://baove24h.info/upload/files/momukatepadil.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/kukujunozoxobovoxidapus.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/fifowotokumevazi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614959c99ace1---dunobuwuk.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/lejijidilorasejaruwum.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/gokevugofuga.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdbcb00b8---15244116698.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/9328949100.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dfdf68f79c13ff7f34922b902a47cdb1/kelatixedu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6036c259e---51570842417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=29+card+game+download+apkPDF 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_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 10868 bytes
SHA-256: d5474c48fe40a4dfe20b5408a4b5e1e5b359d206907b700265da63d2a62cc3e5
font_02_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 17484 bytes
SHA-256: cb092e47aedaca1cc472fbf97c5b6ff5bf3afd2774a341cc96a56f1e5445a1d7

Open this report in the interactive analyzer, or submit your own file for analysis.