Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f43be1590fe1161…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 04:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc641b39e2bc18d9fd13cc745dd62358 SHA-1: 9215de7ca6ffe19a7019986adc8f2949f67e883f SHA-256: 0f43be1590fe1161e42e35d59ae31d9a46dc58edf4cf9c8f82ee908e0fab6276
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981bb1c3dd8---jezamuxizeralavekavona.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ppualcc5gtevvufe39vc1ljf6d/17952333709.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a58f46efee408c11afadea54d53ae61/wobijedalitamixotef.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/16385108279.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/fegunukukune.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/10/vugoxunu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d6c4a92c---nigigovozokegavu.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/sefemirojegedox.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/veditomejoju.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/373bmpsq9c3ab09tnp3tf9d9pm/3049325777.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/xepusigiru.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/tipafemose.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079792458ee6---42062832585.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/zomesemexifabidofez.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/wedatuxonedoj.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/40225686278.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce7861c2d---64838637425.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/983bd62adf0524b892614d6e48fda1c0/56563599785.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e4e942e0---juxolem.pdfIn PDF document text
    • https://ancoraeducacion.com/images/23343196312.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/kopalaxunefuwe.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/gopijibenipepebekaz.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/nekilasanokar.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4rqs43uhbpi9rc2847pnff3mvj/3479319951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=orion+tv+sled2468w+manualPDF link annotation
    • 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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 11260 bytes
SHA-256: 5fb7d97458049bb70032a3ff435cb2d53ab22dcdc5216490fb153361ea6ba2c7
font_02_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 19204 bytes
SHA-256: 2c516d0d00623520400f7b1cee0e7e8484ec50d930478d06b89af66e81555aaa

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