Malicious PDF — malware analysis report

Static analysis result for SHA-256 7233710a8adcc070…

MALICIOUS

PDF

85.0 KB Created: 2021-07-19 22:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9c79d9b36b46adcb389068ae47096829 SHA-1: 07a5738c9a36d777fc9db8e0342a96f63ed74109 SHA-256: 7233710a8adcc070652c04a9a0e6247dd5bda1520b40c85bdcba93c6cb818b25
156 Risk Score

Malware Insights

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

The sample is a malicious PDF file flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://yilip.net/userData/board/file/9977718228.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/926a343055f4aaa852c55a33dc942983/58827649324.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/34712258541.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zuzemomajebasuwosevot.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/92215354055.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083c475ca502---fusogujerimemal.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f71249a5---99708812859.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba1c3627b---11738109819.pdfIn PDF document text
    • https://alutat.com/data/file/5834162497.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/29729309987.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/22ae7ffcd7e775424e06db709414f21e/fomat.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/83555249211.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082798b1f20e---67783884287.pdfIn PDF document text
    • https://unosms.us/userfiles/file/69126879502.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/67246835499.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ad3c0f93425ff0a9ec0d143187e02fad/dixotov.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/botobogajuzes.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rqi70s4e4nje6okdrt0ekc290l/bikimod.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d0ee6784c65f0f5be14e48b8a2361015/ziwuburoxexegezore.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dc4221a06---2914949938.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0nasai3hdeh5eqjrb8b3q0fn6r/tuxeduxanug.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/matoxukis.pdfIn PDF document text
    • http://techbis.pl/files/file/pijexora.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d31dd25d2---90368263732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=green+building+operations+and+maintenance+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://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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 16812 bytes
SHA-256: 7948babe2ca0148e0919cb9a336dcdc3a3be14db83bc8b4866c3b95eca175fb6
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 11136 bytes
SHA-256: e74894cc534f103bf791149acde357113495cdd40b4c3a7c87c89508164a438a