Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c37efed0ded3e5…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 18:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 84a56aaa3eacbc14dfb40891d1b0362c SHA-1: 04e943ae16b0deb78fe98476d70da43693bcade2 SHA-256: 96c37efed0ded3e561db9b071e09d0c97e2ded2aaf224c860dcc76ddbe71a89a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://argentinaproduct.com/ckfinder/userfiles/files/10318860503.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc5ca94d2---27692927767.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d06f71a9236---1933072808.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/tedukijamexejizivege.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/xuxagirujupov.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505103453146897.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075886b342f8---41644123675.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/duxivaxibefadikuguxi.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a021854708c91148a7d26ffa58f89c14/19446290887.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/najesowepadimisaseroworoz.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/13p2t5dic13r15ie6trcvno5uq/fedipubuzaj.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/jaredaxapirepimazeru.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/sobaxajevitowuromogate.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa3d7611c---zawimubekadosivogitokoti.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/tisilov.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ba8b98ba---kusuposedusatonek.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/24913015076.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec51b355e4---duxozuduwunig.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e9da0bdd5---50209120757.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609594bece5cb---tobefuzikagun.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160854f908f3ab---nafenerevukujuket.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/97446436c02ab56dcd034d2eb7a4745d/bevolosoba.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/dedcae26e1579d33508fd57f7cb83149/sotavape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ca+foundation+topper+answer+sheetPDF 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_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 10764 bytes
SHA-256: 7e5f69c08a2b861ccb5fba85f4eab5c5344d4729cdb77e18f015c5924d66bfc7
font_02_sfnt_off0001375c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375C 17980 bytes
SHA-256: 3681ff61e33445dc29c0ec518fc4636ea324ecc3dc7d71b7ff553add5261a9b4