Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91c1763e52c48aa…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 12:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75e10d0a2ef54f1143f02f1bb66111d6 SHA-1: 5982b4911e5186c482d94bf24342f812d0615d44 SHA-256: a91c1763e52c48aa489ff59bb84c79a8d634a5b50b927d61f99ffb158fc9100c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://philabc.ru/uplcv?utm_term=fortnite+skin+redeem+codes+2021 PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f6fad737a---85756414688.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/198afd8eb7c9ee58872051b1ec3c7073/96308477487.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076cd432f4---55916319107.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/jewiriko.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/runifisuf.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/wafabebeluwovad.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/863636135.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df635ca295---78197705502.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/82525439392.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/25190020687.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/nosoxotekiwapujubupu.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/53117953460.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/fogapoziwakol.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xixoxekojaxarogapakalosu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153735eefc59---sudiloresidenunelonijuri.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/jijem.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zimojavoguzebepafurojoper.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/60342955825.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dudujopazebopegigabiv.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/pijodoze.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa8f54e251---niwab.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/zoxojibumutilojos.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/gadivipilesaxonejebojix.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021092310330512.pdfIn PDF document text
    • http://soudureornementalelauziere.com/upload/editor/file/kalinusedexawufeb.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sotadokadoparuvipame.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/livoxitulopinugiderig.pdfIn PDF document text
    • 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_off0000b68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 10684 bytes
SHA-256: c05bce5a6491e77f3addc437ae69c5af886eaff0158252e8edfcf25057b62fa5
font_01_sfnt_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 15876 bytes
SHA-256: 091757a4b113aa7f6188ce9db54bd014c734a3988715d85be950430bed88e0f6
font_02_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.