Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef9843a8a5043c…

MALICIOUS

PDF

70.7 KB Created: 2021-07-07 02:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b7fe4d973d68c9c2b654723a407e1e2 SHA-1: b0c0c77a6b32a53f1a85ce2b3f76382ac4f5bc88 SHA-256: 3bef9843a8a5043cd01ad3b2cfe6242b8b9c1fe0f4801c4433352b9f497620d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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
  • 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://szakkepzosiklos.hu/upload/file/robudexeravude.pdf In PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/32993506121.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/56142904970.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/22c9bc03dbccc7c3d67d3fe1732c573d/redotarugoz.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/80350612423.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1aac10ec7---xesiwufedeniwonumi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0vjglvskejokbl6eeg6qg1u8lh/45557725405.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f420tepfkvfdcf5cjbb9o5699q/35300728172.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f4cbe3d88---21983044630.pdfIn PDF document text
    • http://dhf-china.com/d/files/3640703885.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87285e7d99---27574585628.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xawigilizupojofesafasod.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8u3vi1s9lokonjhkau137f5lbv/pufuva.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/d7c9c3qgr7b03e4rfnfueagcl0/20531905273.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/18766482040.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j5mf98tekhcm72g5dgdu8jlpgk/60074641004.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6993543c4---97631595994.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/mufolanewaxapewobaginog.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/fejuwiwoj.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3b89fb31685991f3b8757b3096f9fa0b/17224303089.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ff47575e---10056941000.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/jotilosojerolenirimuxu.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/xenowejakimiluxezotuwo.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/38870618527.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/bukafekaxumawijakumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+difference+between+white+and+pink+noisePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 10980 bytes
SHA-256: 52f6c6fed56c9c8f339192d31a2ade63eaccfaee8ce409bbbce2cbcda6d02359

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