Malicious PDF — malware analysis report

Static analysis result for SHA-256 4075e05bfda43d1a…

MALICIOUS

PDF

81.7 KB Created: 2021-08-17 18:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f30ecad6cd24065590a56c8febdbb845 SHA-1: dd9269bdd3205a8730b5dc10b4bae0dfdc97c4e3 SHA-256: 4075e05bfda43d1acd5459a0368268b1af22b8630d0169251a81916c607fa5a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress upload storage and disposable hosting. An embedded JavaScript stream was also detected, suggesting potential for malicious code execution. The combination of these factors indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://sadiqandsons.com/userfiles/files/sadukep.pdf In PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/kovosuni.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092554f4f003---44020669605.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/80017692401.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/83877367953.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0338791b2---69069633905.pdfIn PDF document text
    • http://dakmet.pl/upload/funodiladotajinusupumape.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/jobolu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/vaduxo.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/fumepimewow.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d9378771---8220929480.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ea7830a97391d75c1d4c39dd66d3838a/sabixuvepujazila.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/muzowefituvakejege.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/26973354091.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f29adf0a---pixuxuzefaxe.pdfIn PDF document text
    • https://eventspicer.com/ckfinder/userfiles/files/45190887497.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/69438062306.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/desijenifokata.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/gepimoziguperuwaz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/rglm7moblu6faitnri04php5p4/24803245287.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/842ffb7113783b63a44ce3da22557273/1494529607.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113cb33b96ba---zijevidusedari.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/21116244832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+can+i+find+a+cell+phone+number+online+for+freePDF 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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 17088 bytes
SHA-256: 6e058d73bf27cd0333f6764f97a0e58337defb710f9d23cab9becc56140b5ba2
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 10936 bytes
SHA-256: cac815d3314a8298002493c875c92b16a6ba6951c9d883030339de96b08104cc

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