Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f67aa108f79bcf…

MALICIOUS

PDF

108.3 KB Created: 2021-09-06 01:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b44bae187ccc89bd12eebea16331b455 SHA-1: 55d6138fef5d05064d94de14369a25639ce4dc33 SHA-256: b8f67aa108f79bcf3b78dc73b29e68d22d197acfd2e722574f7f8e1d6011916f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 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://crewmak.ru/uplcv?utm_term=redecision+therapy+pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612c13c840b79---83965595508.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0e1ac61912febcae08d30ce846280b19/91036102623.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076b72cd015c---disolamujivunopuzezudimol.pdf
    • https://alsultantrading.ae/userfiles/files/87943903376.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/418fc6f6d803c29d513735c44a8b042e/41992153370.pdf
    • http://afghansolar.com/userfiles/file/7447373002.pdf
    • http://rayocazar.com/images/elfinder-1.1/files/file/88490512453.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160813d2db7941---10276618011.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784c1536b9---64326277223.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5e794b63a7a7c7a929b3c5b0efeb74b9/mufurezeguweb.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/117031c1cca016362e7d8e7e839a3a86/10686996689.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/39989017162.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160f7241772871---lutawefujedi.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b8de0ba---jawonusolig.pdf
    • https://burgaseguros.com/userfiles/file/vamelisefede.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca5238db2---xabavijobe.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/feb6e5b4806ccb26cb720ed0c346db8f/80387249612.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7df223f78f5c483182d0b847bfc5bedf/takalibokivakokererikok.pdf
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/25556298668.pdf
    • http://lawrence-spruill.com/clients/42275/File/54642661203.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48640f380---5168012175.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbedb9898---tabex.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/cb48a6e7a92ba3f00c58b56e58107f92/97118026624.pdf
    • http://smit-electronic.hr/upload/datoteke/11361777357.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014208.bin
36413a5468c85b140e134b9359ea55f9429a37d91404eebbec0015e992f16d73
pdf-font-stream PDF embedded font (sfnt) at offset 0x14208 19016 bytes
font_01_sfnt_off0001732f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1732F 16792 bytes
font_02_sfnt_off00018b46.bin
e6ef4d9f94530efb06c68c2f34543eb289688d61b019b32489c55fc6fced0237
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B46 10828 bytes