Malicious PDF — malware analysis report

Static analysis result for SHA-256 270235a654858a8c…

MALICIOUS

PDF

83.1 KB Created: 2021-07-24 22:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90ed7ccc77262ada03d7da7289048a8f SHA-1: 83ead34bf3e369ae9565ae2f80f4b0f714100ae1 SHA-256: 270235a654858a8c900fa8be1c111bcb0230a8b9d2733d3d49fd611fe65bc989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5256962f01289ec691781c7fa41a50e5/jomebijape.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/j24v5m56hqtd24f0cs6tg5sssm/nopiwapimogorazogerezug.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/gidakev.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160833d7325427---79787250511.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b784ec43b0e6e3d97c9f3833322953b5/55370415646.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/98987522476.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/fezozevu.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210625_F90BCFBC1E889353.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/33348997726.pdfIn PDF document text
    • http://naucseto.cz/storage/rugekisukububixobusofufop.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xovix.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ff99ae8d---jiguke.pdfIn PDF document text
    • https://epiphanych.com/images/file/14655917199.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/21752275842.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4088704da0539880d896d1f26a6209ab/setunesovupujatopemesu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/db6af46e5a8e2a91c8c04592f2c7dd64/moxolepirevarop.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/47e90f2a00637f5c5cb62d495c2606e0/donexedawutagazonufawe.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/70265377207.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea2ce151f---sanipasufip.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/59015901206.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/mepavejukilenudulisojav.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lusavagamexuxibukef.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0670a79fe2---8780084680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bath+bomb+ingredients+suppliers+ukPDF 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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 11224 bytes
SHA-256: 7b24af2dfeea601c4734c3e294efc5ccbd004dfec280631dca670a0b5592b276
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 16640 bytes
SHA-256: 57a0f197f945165cae3da30adec8fb82c9bd706aba1855f8aa402633f1201b88
font_02_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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