Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a7e84295dc55a5…

MALICIOUS

PDF

62.9 KB Created: 2021-06-19 12:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: acdda3cc71ef4d97a98822857e758abb SHA-1: 9a01ae325720e5fb61b2f8fc26b2580a9b5ec791 SHA-256: 94a7e84295dc55a562618ae7f866b1ff7ee5e8eb2e6dc557501fb9c116cb6aba
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the heuristic firings suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/55865d82a297c478ca2638a6ed71e845/6604025578.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gi576cuso5dc4fmlmtnkjrht6v/forolulotivu.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/75983288470.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/xajenoviro.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/sawirurerexoferikotavid.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/26480127538.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b712ba5d86f---4011560138.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/91674883469.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ug6n1ho62f8tprqasn783lm20/loxoxodegelufanaworako.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4d4154bb---gekenuliruzawowebovib.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/33368865722.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a746a989b78---78574358945.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/eb619bj06di3gve2o64ltk9mvn/lerutoferi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6b0d76151b066f4a2d5a623c179b7464/vovutudipu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/tuvapagutoluzebogugomufow.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/tixonufadotebon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ankita+dave+latest+hot+videoPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA7 4928 bytes
SHA-256: 167d4046669ab601047ee26712d6bc332f69b44f5db943855839f4335bfb778e
font_01_sfnt_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 10332 bytes
SHA-256: e1988240a312f70742c3c703092bceb238b4992ef2fb0a3beb3d97eeb6596fdd