Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c9df9b41502868…

MALICIOUS

PDF

86.9 KB Created: 2021-08-12 01:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 205f6365bcbb25305cb4720e7dc426a8 SHA-1: 9a8222a07939d70501deb2d4e01144dc2ec49591 SHA-256: 84c9df9b41502868ac052bf9195d5ba9d85c60a302087d4d868e26ffe45c88d4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The numerous embedded URLs point to compromised websites, suggesting an attempt to redirect users to malicious content. The PDF structure itself is indicative of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.uflo.edu.ar/ckfinder/archivos/documentos/korenemefakuzimulan.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/17976963695.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8cf420eaa16de92ec0ed866e853fb60b/34027588476.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/77944771082.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5271710cc4e15e9ed372a57f3eb19180/60117128250.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210511142445.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mvn1rgcdqfitnjdk487ltqdld5/vukoxuridedoto.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/18599539102.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/xefufopuduwupefig.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/bopurexovorexijamub.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/jizepupuvesugijorikagufex.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/57d98fc61a9e05afe4dd1fa6e5d55364/malab.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/55545135111.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210730015204.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5ffc1539---losimunumusatanigovoziput.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edec7d540c---fiwaz.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/daxadi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a148771cd04---ragakonugo.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/mavakukejetowaxekuposij.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/mosojewirilafo.pdfIn PDF document text
    • http://heatkings.net/fckpic/file/wegebiwuj.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/18205943759.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d643110b38---29643563010.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/th0tuku9te1b0b2am97ipal2u2/55210233141.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/pejuregekewetalorugabe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857259fa65---zizetiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=is+phenibut+legal+in+canadaPDF 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_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 10764 bytes
SHA-256: 064dbc50bef52ca172ac15c7387a7838aa7710c92d1962f9d905515bbcfde122
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 16824 bytes
SHA-256: 23cb25ff203ad6614d3632e2d5ea0f782c7db442e21b3720d337d13e0c892ea8

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