Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc745054972114b8…

MALICIOUS

PDF

79.1 KB Created: 2021-06-15 20:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6388cbfb8e912e3f75c5fe03782673c3 SHA-1: 71d80a4c6c0833d793cf409f7564e98f37e6484d SHA-256: bc745054972114b8967fe94babf8dedab467b8de4bd7cb9044458fa2a8062476
196 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=jelly+skyblock+server PDF link annotation
    • https://tootooair.com/FileData/ckfinder/files/20210615_A2C3752E40C62680.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068c95df4a---vowipuzabifepopigoribidif.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd25bd9ef---nevofu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784304376d3---wipamodonavobazo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/09cc6795040943b244e3a7902fa081a8/fizunalomoxe.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/66170196638.pdfIn PDF document text
    • http://dentherapia.hu/files/file/62657438334.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ah5mn0fgj6rk28tfrgg4vc3q8m/depurasivubab.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7f6087dd---mukoluz.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd024a6e8f---56248853288.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1iooik02jsjn6bt5j88g89ul23/papave.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/888362aa6d5a4bfdd0d4676dad732f9c/vedenokakez.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/nexubuvulekafovuzogelur.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/25564a050741eeef506847243aafc3c3/4025343093.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7u24tkm78k27j3l7ljchi40j65/42578190395.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a1e9ef4b56327b65c9ce16daa52c4d12/zejisamisogereka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 4940 bytes
SHA-256: 769463e396aa9ae4e461ae50bdec24d6489395cff8b4d979a39b75ffd6dc1bcd
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 10580 bytes
SHA-256: 2303c6e478d5796ee2bbd05019f0fdf1c65783f5c915c7aab7fa4166c1a2a303
font_02_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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