Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67d8d8ded1e1f89…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 03:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f2a143e24cdc9e15729e4fb44420cd3 SHA-1: c1a8950e907784118774d26f7f9ca2b164e35a2b SHA-256: f67d8d8ded1e1f892b1ae400885945bcb96540446b98ccd74f0d4d2be9f86d6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on potentially compromised or disposable domains, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://toscanafantastica.com/userfiles/file/14099807926.pdf In PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/28480998661.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/vumulagibi.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/19834640733.pdfIn PDF document text
    • http://klpa.net/userData/board/file/soluvilotudatadubu.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/57037618449.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/topaviwanuwi.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/kuzokevilulizurabafa.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/fireloxiweler.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/54557831521.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/32549693872.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c162666e7f---15184376654.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef35a66482---24897854540.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatulifuvata.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/24110774617.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/nuberur.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/pedeserigatubu.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/legumoduvotipolajo.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/51071934028.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9b5c9f61b79b7dcc4f88c0dc6fe2ce01/ragupufoxam.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/6972972753.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/55045556978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kodi+update+for+android+boxPDF 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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 10612 bytes
SHA-256: e34d1c0cfd737bd083473ff1fcb89d359a399fc6d615d8caafbd814ef38933e8
font_01_sfnt_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 15400 bytes
SHA-256: 28210aa44a820b1500d506d406d3912a48e7ad293f533c6f974332987ebdd1cf
font_02_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1