Malicious PDF — malware analysis report

Static analysis result for SHA-256 6133ecbb0fa17e21…

MALICIOUS

PDF

105.4 KB Created: 2021-06-23 16:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 11e30f6c54aeed220dbde48d704441d7 SHA-1: e099aa4a8dcf4c5047a1996d3266d4bbf078a7a1 SHA-256: 6133ecbb0fa17e21dd3ab66e59b12fbf72390426473369f437a0df5f33f89013
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 0.9996

Heuristics 6

  • 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
  • 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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2ktkkc33tijpbqrcnlv9kekuq3/nowefijuwawawogir.pdf In PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210623_16D1A62092594D31.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c6679f700---7721204127.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071beade60f3---jibedadejaridisepu.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/tososuvalabojipujolafan.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/tuxewafipopudewonulesupid.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/18985186989.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/91fd6c47894ac096fa713aa7287c963e/96430721054.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fc4b98f9b---pivulemaravobonu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29f10d49d7---31643665051.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/72112036853.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/tda4sd6pj7cs5379cdsqqe79i2/fesuxubevaxotig.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/21493895265.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b45edfa3537512f23d5a505f81d84857/78293652894.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098984a30ef9---rosaraxediwubirezim.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed4fa49824---rerageviwelewibe.pdfIn PDF document text
    • http://ktcz.eu/files/files/98574140002.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/83634256633.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4f386311---81990601678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=duracraft+heater+cz+600+manualPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 3220 bytes
SHA-256: a1cf83725e0086fc2b95c1e235d74f066d4a05d1db79d5a5caf46edf23212b82
font_01_sfnt_off00013f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9C 5288 bytes
SHA-256: ffc02fa59b1e0eeb2d7feded40c7be698f816480a3f47c151b71eec2c6bd5ca3
font_02_sfnt_off00015178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15178 15020 bytes
SHA-256: f6f540a3207d6fb442ac3928b71cdceaab73654605690abeb8644c4946e989bf
font_03_sfnt_off000181e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E7 16312 bytes
SHA-256: 98c88da428f02aaed43f99b1fc79e33f74e28ecad07946830a447dfc3e643737

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