Malicious PDF — malware analysis report

Static analysis result for SHA-256 2224f9775505d193…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 02:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3777f25fdeea161f49b5049651341135 SHA-1: b7169cd7c8f09423bfd41750013bb13bbc8d0c5c SHA-256: 2224f9775505d19360b98e93b342e8e9b2c96e2b24e9b625d61c9d7a419dcff4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35426ea10---juwedebakiwuxixo.pdf In PDF document text
    • https://anjingliar.com/contents//files/fuxasukokobedekugunow.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/96274780671.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/powopazuxovinodexobe.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jixodijefam.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xizesutaz.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/89944306672.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecc4ab24de---norujuro.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9b1125c0---gubulogife.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a8dea124---79412273828.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/rutoroguga.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nn5r00pf6s21nht6bv96dvdbsa/xanetasudoguzobo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1653f5c5b264f2eb618450f4d23d34cd/54452556905.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f25465c2842---duzarizirogazosalof.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/zavinodewimofitorarasa.pdfIn PDF document text
    • http://paliukenas.lt/i/File/50819911533.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/00c81756d2a7af9bdddadb344beaf10e/57404905419.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/16078652698.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a9b367d6960e1cb82187bf55407858d6/fedilolofedorupatexega.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/89174305521.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c09154691a---gixodet.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/xavivipurefujomisaxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+himnario+adventista+nuevo+y+actualizadoPDF 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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 11156 bytes
SHA-256: dd42075dc4b2b15677187b2ac4e04a2242d984295244e3fc4fb87465d21a1346
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 17732 bytes
SHA-256: 37353c7279021cdc97d8e568939e801d48336ce39d2f27525d1bc1bfdd2045be
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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