Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05f21f78a222303…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 20:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67b774bae56e1fc2345e4357dbe0311e SHA-1: bca4ec7f9bb9a829edf1ad69814ffe6571e67f9a SHA-256: d05f21f78a222303d2b0b455f8893feb4d36c5502bb95048923cf4cc576e1e66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nvsrolko.org/ckfinder/userfiles/files/35368316129.pdf In PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/zemoxojudepivakalutapunud.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/peditibezofesokujijokus.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16121bdb463748---dokikiriborudupivafom.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47cc9515c---14625147428.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e56ddaa13---15591075852.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce592c8a1a7---wabutawatilula.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/nuzidubusogogi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/u7g0qn6lk12hrae806l3kjm596/garavelasuboze.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/8841975000.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/93813909271.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/xazivopaxexalebofemisurop.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/pitafobananabigor.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075f18812a4a---fezipotonaxerokune.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/09q8drgecosb6t11579c259scl/jovumelolosovunevitiwer.pdfIn PDF document text
    • https://isosklo.cz/uploads/fupoxefisibulovaloze.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/32485543719.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/99878814490.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6f9e2d1cae06d01daba3d34e2ddc8b88/88534842992.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81cc58b91---zafifupotisesizixa.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/60303487975.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb530bfdb---41391506109.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nutazudojozeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=automatic+room+light+controller+with+bidirectional+visitor+counter+pdfPDF 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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 11440 bytes
SHA-256: 69639404ae89b57f2add2131f842b9ca357e162114ffa91e0f9be6b7f92f6417
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 17932 bytes
SHA-256: 5518a2b3db50c7cee156af69af02223d9983efab8983bfef74a56d3f86f8066d

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