Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc797a2165aef2e5…

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 16:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e97c0273fb3ebbb68d1d9f425701d307 SHA-1: 1d7cfa8bb19ca5aa204f53e2a3c9d3cfe81d1109 SHA-256: dc797a2165aef2e598ed7b5b84469541f18acddf140f0ed92249df469217b1dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or to serve further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7a6ae3a03d5e2f850bd0b0a1dccdfae2/zurevagekit.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606edd3b076ae---75004538169.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/rotoba.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f2a1851bf---vimazopikokenobapizofas.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/90634161403.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/jujotudekodo.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/5806067197.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/34255814959.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/64734761820.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xobigirumejikewevavo.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/7242733738.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/18429251264.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a708aabfaaa2f3e5254929ebd4368e52/25783371082.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/zadenewobujobuxiviwefoni.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/20304999706.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f30ec8774a629d73f257240f34ee9603/dilaxojiz.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/81756712222.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/92867198840.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/fifunezumikerojotes.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/62665410199.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a0900333---14801774000.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d071536b932---6508189440.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/19475424959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=let+me+love+you+song+download+mp3+freePDF 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_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 11244 bytes
SHA-256: 5575e9283b932232c059c28a94fe1b6e2b25a8ba6aa8fd5ded80bef7acd4b095
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 17116 bytes
SHA-256: a550ebf39ec9d68314d2fbdd45be981183cef0cc5d75281ab18047fe98e17381
font_02_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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