Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20f2d21be55ec37…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 12:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a40230c97c142ca8b72e15eb51ee34c9 SHA-1: 4df2288d407234dcfe0619342fd5a04a0645ba37 SHA-256: f20f2d21be55ec37342dea5aba3cee86c3f957c568a2df5125c6dd05bb12cbb4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://fqcycpa.com/jingkelun/userfiles/files/20210619192441.pdf In PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/tolumewekoxixexipo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86e7854a5---xirixusefikitozoful.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/senupu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611177a1a9c20---18164225295.pdfIn PDF document text
    • http://upakuika.com/img/file/padosenebilewuwu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/62197220236.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d79833790---47349221777.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e37e0880---fofoj.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/56002474588.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160746d723b0fb---vebukinefesafizowamo.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/bamonebiz.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mitaku.pdfIn PDF document text
    • http://newmob.it/userfiles/files/vetusu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1fe5a51e---rizagisofuwukivobexuluvup.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ac7df953---76386007927.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/japedutufanijepu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/dipokaf.pdfIn PDF document text
    • http://mayjack.com/upload/files/bikozufixekuzepowiludad.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/kekivelitowolojofadoje.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609096d63ab51---45722704028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gospel+progressions+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_off0000b28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28C 16060 bytes
SHA-256: 6d1a7492df4c85e164c1b868939e3d6dbacae924146838140344b3d8ebdefbf7
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 10452 bytes
SHA-256: ad2694eff44841ba6d5849e6ece76be9456b8b70dcb87db09a4d3a9acf7c76e8
font_02_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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