Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5e3dbf3cca5562…

MALICIOUS

PDF

82.4 KB Created: 2021-08-28 06:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: fbebaeb9a51c4ece2b79bfc1fb18da81 SHA-1: 252f2eae3c78f3f596e0b5b29a0fa04280588d56 SHA-256: eb5e3dbf3cca5562e2357bfd510bcc098df71e6dd862fbfc2d565d570d61fed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://amitadevnani.com/userfiles/file/21847832267.pdf In PDF document text
    • http://versobrokers.eu/userfiles/files/mawowepukotoduke.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6421e2e20c4ae17e4460e5c85bc166c7/4454936050.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/xukaburuj.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/31109849683.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910dd321613---65971711533.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086e32c41a44---12306116571.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210719124834.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/926d4d40203161a7609f96f77f0d9a49/52875367214.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/4697891432.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/nelakurosupetomomerib.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/jogik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5710c40795---bolajowijijuwisemoxozot.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/itjiceccn78o0pau8j7q6ees8h/57807622151.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3f43af55d---vetikafadaramikokaliderot.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/59805568639.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/98464359409.pdfIn PDF document text
    • http://skene.es/userfiles/file/nisiravaroturimazo.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/robawovefalowa.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/2235186044.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66dc4ee5bd---75474887286.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/xuxaxomani.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pimowefowuzorogujut.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbab87ff2c---51911994687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cherry+tree+leaves+wiltingPDF 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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10564 bytes
SHA-256: 7abc4ecb14240b6a58582b8c9aef4f7965fa3ef70b92b5c48ec0afeb1865b430
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 17956 bytes
SHA-256: 239ec1f8c6089f1c880b6a7ed7e37b516f51a2575a180c31eaa864c547d9fc5c
font_02_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1