Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f279be063a7640…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 10:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22e9306719410aa06ab3d9d045fdfe36 SHA-1: af456baa907898d03b0c0ffcd08a66cf95dd1340 SHA-256: 92f279be063a76407c09ec5ecac3e34e254d41b3249a368315536271f47458d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://worldtile.net/jangheung/userfiles/file/38894460333.pdf In PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/33058198931.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/23707615860.pdfIn PDF document text
    • https://tessuno.com/upload/files/61450dbea5cd5.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/69209665002.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/degigevabelub.pdfIn PDF document text
    • http://bscartridge.com/pic/94253606007.pdfIn PDF document text
    • http://keacg.com/upload/files/waketusamup.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/pudizadorafowoviw.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161445a91ec09d---fujusuraxipisevujimo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/967942550c4262fdac76add863461b9a/motepujulobugogufimimuk.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e05294d7ac79723fa0b63755f9041bd6/newunanes.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/xizozuruzemewoniwelebup.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vufabawafirofo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e79e5353d---90734694798.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613686514e55a---nabujakofirurof.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/52505175891.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/57669793027.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/laxunezonigotadugove.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8e6bad439---98984387133.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/tipugizotezevakal.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/61922366712.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/nidafitonupitagose.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/61269420048.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pixejinarazap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=8+ball+pool+archangel+cuePDF 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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 10644 bytes
SHA-256: 165d882ed614aa9cd4237fddba1d292c13b21eb06889c7e5040e248104e81a49
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 17288 bytes
SHA-256: 4bfff5ef5cc85956a744bd2aabd72d1da1e205dff94b8f0ca83b06ebbecd116c

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