Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef25f4089b0125c5…

MALICIOUS

PDF

71.5 KB Created: 2021-10-14 13:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 09d069a34892fcce8ce7ad1beec98476 SHA-1: 2a6c4225bffa01276817320c84a6f1ebb322892a SHA-256: ef25f4089b0125c509f93c389bc2e09040884e99eff99d9fbdfa4c9450585ac1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the presence of a link farm pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://lesbambousbleus.fr/ckeditor/upload/files/dazabun.pdf In PDF document text
    • https://pindimana.in/uploads/file/jisadazotimavizivosetope.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/lupiloz.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ba9ad4c4---zusujadiwugufezekes.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/kuninujevujujejonifub.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/59990141421.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/jasaberodaj.pdfIn PDF document text
    • https://gameclub.by/uploads/files/ruwubamipedilizovunukoxen.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/52684234710.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0efc570a8---ludasexil.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/27626759193.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/gitimogukuvofigep.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/23666865318.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/66028839619.pdfIn PDF document text
    • https://gilbertems.com/videos/file/tuxaxapadegamelukijapixe.pdfIn PDF document text
    • http://355353.ru/userfiles/file/87581521357.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xolodo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538245510f3---38541113938.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161598b8a86d9c---morelimuveg.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/xakebisepiz.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/jomubilebotabonoladu.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/fodureroveworozesaxi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16161dca78baad---nupukefilafosofakegor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/vItLtdF7Pec/uplcv?utm_term=interview+questions+in+c%2B%2B+for+freshersPDF 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_off0000b6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 10572 bytes
SHA-256: 782cc4b75ee84b5e4b936956e08aa37cf0d5064871b3a7767e85b39c2619ca83
font_02_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 16220 bytes
SHA-256: 5accaea3b1f3ef901bbfeb00c320d9a1e17d4c3f0991e941ea93c60c7673046c

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