Malicious PDF — malware analysis report

Static analysis result for SHA-256 4714a9c971d0c958…

MALICIOUS

PDF

101.7 KB Created: 2021-07-09 01:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 810317bdeb185ddd4625ab54b39bd426 SHA-1: ba012f9755067eb5c4f1892eb502aa367a8584d0 SHA-256: 4714a9c971d0c9582aa6d0f30715a1f31ddaba40fa8e020f69f24e02c855a10d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the heuristics strongly suggest an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/dc67d3ca0093d26d2aee8f51baa6d9d2/59666481458.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4d987f9f---fijarawafijemeguminavomop.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072eeb5648c5---53263913939.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/62169379867.pdfIn PDF document text
    • https://patc.fr/imagesfile/13597387031.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3a904ed6---pakaxojokizedilabele.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8573e4d374e9142d78efaad3ba087a31/bisefekijopuzata.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/jodeluw.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3b40f4f2---84422479248.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e775001365c522480285a65fdb924575/41694377617.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/72877222329.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e5grivrjb5abob1ugf1qlkcdr5/41746762294.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074d31484918---30374249307.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jemidigubotadowugexiliguj.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kodik.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5eb6fffcfcc37b327c27fa6ad74d89c4/zabum.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c82d8795---zezibuwipidemutobinopefo.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/91714192058.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/94338571362.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086632e2035c---xijiwamukat.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f61ed23a6---lozejujosip.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/114c5163b2b90cdd8003618bb8b3aca3/wekeso.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb22ca5f89d---nulon.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/r8kd20n53eec7dos186ht96pu0/15833358622.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pv8i40u0sv95gh99843u9jtv56/gejasasawizirum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=game+of+thrones+series+3+episode+4PDF 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_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 11008 bytes
SHA-256: 2d8dc95c5750824f383b8b81d2f30d3421a8f04cb85e383a1e4308904b3d44b2
font_01_sfnt_off00014297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA9 17864 bytes
SHA-256: 7729c8ac1f42a9804d41a846edbfd14695778deccfd6ed07e8f8466bd53ae1ea

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