Malicious PDF — malware analysis report

Static analysis result for SHA-256 33893dd846c67996…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 093601975a2d97d55e990e7c9ca94050 SHA-1: cbe87bbd3470d2904079a6b5f836aaa743b216ce SHA-256: 33893dd846c67996b638a4b58b3dd9c0a0acbab7df3bf460de0835e77abdf01d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a15f2746f---femagukezibik.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160926560afc43---mokojud.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fa6e711e0---98665505869.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/uh6dgd3n8kejnuskvko9qiqu67/tibor.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/45629655651.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/99381771406.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4b863f99f108a0f623fcb5bd22554b19/ratubebotosepem.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fb0a57c15---gijazapi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c88023e71882a1ac4c458828463ca510/79696031403.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/forumajadotu.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/xulumamoge.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tozavas.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/54610400405.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rvu8s3vbafpbtumep45m9lkmcp/wimiguxutukew.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/xizotagepelagagadoxed.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xikonexuseriposasovol.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/filagotijok.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/30894712842.pdfIn PDF document text
    • http://aimic.com/userfiles/file/difopodogujetabugekifuv.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fupowutobijelulewefowefav.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/23c2a192c9c7114c7a6462d11cec39c2/6575101475.pdfIn PDF document text
    • https://gilbertems.com/videos/file/12161632899.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/gufibizekukarakaleganebe.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/53471638166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=of+mice+and+men+chapter+2+reading+and+study+guidePDF 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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 11260 bytes
SHA-256: e2e896f28037cd300f5095b0fa0584c873f0005ee9b6d05d7e240705f13c417a
font_02_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 17864 bytes
SHA-256: 01595f295cdb518d3da078cd32210104b0667965549afbdfed0d30b9e9ac08bb