Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8c12b7003c4e6b…

MALICIOUS

PDF

86.4 KB Created: 2021-08-13 11:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c08331eba45886084b23405bf061867 SHA-1: f03475708f1935d9f7f2063af322ffb978cb7588 SHA-256: fa8c12b7003c4e6bb377e3c3cf25193543c3268e85067c97669d7f0b9ace1cba
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, a common tactic for SEO poisoning and phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://porpora.eu/imagenes/imagenes_contenidos///41500688756.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e777b439f44---zawadufemijigovuxiwefu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dfae539c780e14271a3ea5bf17d83ae5/wikup.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/feboletibifujazejuwigami.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/rojevov.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/kuwazi.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b4ce433b53323e9c32472f27c59e56d5/97665440168.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/15587337914.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65a7acd2b0afc070d06c176a73e9b5f6/10812789812.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/38938428428.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/14029433561.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/pezoduw.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/egf0vgn1icsgmekifbln85ib0f/tudejegibesijom.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/16508852322.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95d84b152---munetupefugomusogedari.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/3745988611.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/pebajeditorevobolidad.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/347376a18ce91bf0d1ea4b52bba030b9/92273905637.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/faxesigokemufikus.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/telabitozolonekoforu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f649c03348d---vafebanuwu.pdfIn PDF document text
    • https://coevent.ru/upload/files/gitexori.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/lapuluvelowigod.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/gizegetazesifolokegodov.pdfIn PDF document text
    • http://allycatering.com/userfiles/gujizirobusavik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+download+watch+faces+for+huawei+watch+gtPDF 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 18168 bytes
SHA-256: 591b858965b984f54998a221fe2465e5489ee5bdde69a46d06e397a39a2dd8a9
font_02_sfnt_off000131fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FE 11088 bytes
SHA-256: 87e16f9e0c62a805ae64c5d15c1288b2ce7993857c578c58622ef72a336a0ce5