Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d46fcd618b6805a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 21:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28edaebf4e2b28459b6a1f9c4d83719f SHA-1: 5eeed969315ad3e13400f940f3702b103b6d12c1 SHA-256: 6d46fcd618b6805a820ee2fdcc2958bc619446a82a55d7c4ef0ab24ca82c6b9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The presence of embedded JavaScript further suggests potential for malicious activity, such as redirection or exploit execution. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf3bbc88b---3409038028.pdf In PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/90416536746.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/pijezefireri.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ppmc3k89mkou0f9s537qif2sv2/jeziluvurawozemibezumu.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/jikuwipatude.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/duwunuvawerarufiz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e74a5f384---16409336278.pdfIn PDF document text
    • https://badrivishal.com/media/10326706745.pdfIn PDF document text
    • http://afro-safari.com/upload/files/17394237844.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/42942350316.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc594a75a8---7334001619.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/duzufetozum.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/53244650271.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cb9d99dac6d7c085cd1bce926c89e14e/moxidifubadona.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d3458590c6b55ced6227a894c6fdf675/83470040371.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/95e720c72a9dd0f61f0e5db7a9e25187/jegaretisejimuvebobujoti.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/11893961318.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/xarulaloxemugexafonijod.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/zubukuj.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077574c868cb---97941777004.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13492bcdb9---dezelibitixokawalamudu.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/96827786423.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/virudotelumuno.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7848886532---57090043906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=othello+socratic+seminar+questions+and+answersPDF 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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 10992 bytes
SHA-256: ee905fa2bcbdea3bf131d948db6ca2fa82a9ee743a520107c8ae756798396b7f
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16188 bytes
SHA-256: c1736de2742439244d0fe56a26f138ee69898817eba6f5a4d6549f658d0f29d3

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