Malicious PDF — malware analysis report

Static analysis result for SHA-256 b076779ff9653425…

MALICIOUS

PDF

80.7 KB Created: 2021-08-23 19:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13fffd417c98a82c2a0a3891bce44f3b SHA-1: 09184e904e6ac0b91cdaf520ce7679ca1a3ee552 SHA-256: b076779ff965342541c7f87f8ba02227c18555188dccb22142bf23b97557e58f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://flavourit.com/uploads/userfiles/file/file/30036433828.pdf In PDF document text
    • http://wittlich-luexem.de/userfiles/file/fevuxixetiribobonu.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/suvofepiketebofol.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4acmsa98kuj43d7lb8d4dfliam/mosijuruvafifit.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2272fac764---75552658357.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d61d5ad6ec0---gomasal.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/38584715336.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/nifapo.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/15451764860e1882267c33.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/robozewinaxeza.pdfIn PDF document text
    • https://blogsma.com/files/mibofatubuvereref.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/fidilaz.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/sfb2sohr9c8ohfikdfpbj7vt8a/48688657922.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/sotanibiririmo.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/27635501984.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af4b5f640---83603246463.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8t0jn0sv4ff4eltcn3007g8rdf/lenaguxaxidiminubekusiwiv.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072196a065f4---suxakatumaz.pdfIn PDF document text
    • http://freeski.hu/freeski/file/72163199803.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116785add6a4---fenatizu.pdfIn PDF document text
    • http://allycatering.com/userfiles/93491251904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+enchantment+tablePDF 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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10620 bytes
SHA-256: c035ad3e38bc187f05fc799879c810f48c9252e6eedf8a6dac44f11e8cef6beb
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16880 bytes
SHA-256: 9ee159dc561bae69b349682355684689584cb6c05e37d025a233edc584440a80

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