Malicious PDF — malware analysis report

Static analysis result for SHA-256 c651fd48cf8a0c43…

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 06:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f236b4d16e1a17e4d7fee7f68aebf9f9 SHA-1: c38e5c087e22c23d1bfa110bea2c655d146c2d4c SHA-256: c651fd48cf8a0c43442e884c01129e42373bcd1012465079fc0591c5dc4fc3d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly those hosted on compromised CMS uploads, suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba20c5a6e---wunawobuforaneze.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca0aacc8c---3115222284.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/76fad45ecd588e7fc5c4a762ff51b8ae/devojerotokufo.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/genekel.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/56449850651.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/dosuweka.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde1b76fb7---busibaz.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/57474371766.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/gobodezido.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/xirerep.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/94451061202.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608819f9e329a---vekonikubajunetufewawurod.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/40ckeiiq7to488aqadmhs5d5j7/tarukuv.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/60c30a246acb4abd282a2639ae5244a0/42500013253.pdfIn PDF document text
    • https://electroagro.es/pub/files/kujuwiwimuzinuguvutuju.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/pewepuvasexedamepukof.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/95bdce0e92475df374e24847c9194643/27943667542.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/meguzezibit.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b2n859kpta9tsmtjsbb5m8ohhr/bexib.pdfIn PDF document text
    • https://digireg.dk/upload/dagafagu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/113db03a346669719dff6f105f1bd4a2/jowob.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/pifanebapik.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a3d63c730f8c98c15c8c795a11f19e58/38641465727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manually+activate+windows+server+2016+kmsPDF 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_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 20068 bytes
SHA-256: 755300e597ae05edc92d3035b72f0df317ee12e591231e6b7dad2d17e237e3de
font_02_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 11444 bytes
SHA-256: 060f8a45b8a75514bdc624e4af459217bb319befbe36df0500c0f2498fb82e41

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