Malicious PDF — malware analysis report

Static analysis result for SHA-256 459dfe07e053147d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 09:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 557e33f3edaf0724a06a663e31490118 SHA-1: db08ac529f4c123d2e2d3695e558d15e1bec8040 SHA-256: 459dfe07e053147d690d62ecfea58b66b7e22e7e6a01e7f9e946703b53e6eb8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript is likely used to redirect the user to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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 https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/oot54sgpbu28634pdfsd0qopt6/64892479909.pdf In PDF document text
    • https://aprenda-atdi.com/uploads/files/gipaz.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/37603220804.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/45167720727.pdfIn PDF document text
    • http://fabtur.ru/upload/files/58895960817.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6u755skv5750192g3284r7grri/kigeziw.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d5bb05b04---wadisokekin.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb36077a1c---12505091595.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f3dd7a7a07177bc287f1cdc12c3bcbc0/17387018320.pdfIn PDF document text
    • https://codecs.ro/images/file/73286788520.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/q4htno6i1ufb41k189m0bj83vk/76091200904.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/08b60924d05d735d483eee1c25cacd93/juwedulubofisagawodusu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/nupapevifebujewogowu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098868660c06---67885788130.pdfIn PDF document text
    • http://jarosi.hu/files/file/nobokimorabaputew.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/ledizogipi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/14968435545.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b6b9e033---funufobawutaxodufelis.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/17505970139.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa5ab94f3---5953910472.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/wujupaxavubadewuwate.pdfIn PDF document text
    • https://questyme.com/userfiles/file/55761160241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=digestive+system+worksheets+high+schoolPDF 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_off0000bd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 16816 bytes
SHA-256: c2d0681c306465ad72242ea70a48f63cf634bf9148b5c475cc9032a2143326f8
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10772 bytes
SHA-256: c192937629d2d2c93b03a481da5627590f4f2eeae7d9356674a71b6d64fd70c5
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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