Malicious PDF — malware analysis report

Static analysis result for SHA-256 040790e9f6305e96…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 07:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1423012b0374d31fbf1a61bde074e28f SHA-1: d41ab65e4c17f0527f3dd1d352797c993c83ecd4 SHA-256: 040790e9f6305e9622dd7f1aaea3a7e13c402cff01e84384b9fce83b092367f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16113d6bf90f2f---ziwatubanidigujibimorose.pdf In PDF document text
    • https://coevent.ru/upload/files/7504025129.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2e4831103---xemumizek.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/41964906340.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210822092230.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/murasumuvimarirofalu.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/58373213499.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/tebewenasisewa.pdfIn PDF document text
    • http://uco-kampen.com/media/files/ruvifatasisifarasatelovus.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bbb6b384f---81934172010.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/99902042924.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/68612060020.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/gokevodugewiwizipokixulu.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/kazijafi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8b76ce892e43c1ea5951670794451cb6/80707404267.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/netiwatuxawigimerawujat.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/24376035565.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/bfc06ra80h0rs1tjns8sj1oeh6/36566982358.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/42120679070.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/jozezejaw.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/linesutexupisumef.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719117a5232---76811684468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=measuring+with+a+ruler+worksheets+3rd+gradePDF 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_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 17364 bytes
SHA-256: aacad4cf6dce3e53b79e0b810ed6e8e37ef7db49e0841018c558db38b9872cd2
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10968 bytes
SHA-256: 2f844ae4ddb9711fd7d9a21e1cceadb96d2042015dc9316c12282546336a330e
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.