Malicious PDF — malware analysis report

Static analysis result for SHA-256 a432200030c1a27b…

MALICIOUS

PDF

81.0 KB Created: 2021-07-17 15:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4b5d7379ae96547ee2f47ce902fad84e SHA-1: 530142d2855a4e122e953ba37f4eaeaefcc10fee SHA-256: a432200030c1a27b542cff747573973aa347423762a46a13bfe3d4d97a9a7b75
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

Heuristics 5

  • 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
  • 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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/050a8f531ae3002af37924db686c2e17/16733878798.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bd6fab937ef2a17f533af13ad5407c23/lemijaxeri.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cb271714---68482980290.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210529_AD75B6C555DE428B.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/nonininikimikelijupovobo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609230bfe3039---42451311544.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/60923506284.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/75209280932.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c31b16ae6---woxepegoni.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0674b5f528---sutafuduwitija.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c954877a2ae1f4c1e78c3fa12f8fc809/72188512122.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/burivupufemevuwo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae7d0c35f---9581438523.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62d09177b---viveko.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160727f31b3eb0---totanipupik.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48c42cabb---ketolojonasib.pdfIn PDF document text
    • http://come2menorca.com/images/file/begogekenasaxaloserud.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608331b5aca41---21049302359.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b86490904---54179624098.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/70047e76b4de0f32aceb08797f7d03ca/69878057013.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/91368724868.pdfIn PDF document text
    • https://ebooksweb.net/files/file/55488937692.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/38c3va72vkqrfdf6elbmmkcre7/tiverukutizubar.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/figadatad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=brand+awareness+questions+to+askPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 16740 bytes
SHA-256: a22c28504aa340c50a57477a896c3f3b038b7cbb580082557210287c5d9d3585