Malicious PDF — malware analysis report

Static analysis result for SHA-256 2865cedbc5280a8b…

MALICIOUS

PDF

70.4 KB Created: 2021-08-27 18:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 719ef4adc1e12e05f39da28f8a92522e SHA-1: 8b8e08d15388c0e45e2ba74dba1cb40ebf061f53 SHA-256: 2865cedbc5280a8b9658baeb6b4f7cf1a58a56751a597ef451802041214fec97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://geometramaurotozzi.it/userfiles/files/tonevulisagot.pdf In PDF document text
    • https://heuresromantiques.com/upload/files/28706340500.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/92234656993.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bd5vvf5nl13d0k25igvoulf031/falobipawine.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210606220604.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ab89c7bd3b9a4c4352bcd09b3d5f05f0/mokirukenozekaxidibaku.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/bamukix.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/55245800535.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/22796765991.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/57620240079.pdfIn PDF document text
    • http://kyea.org/imageuploads/6543355497.pdfIn PDF document text
    • http://airsoft1.ro/files/file/genokutekosa.pdfIn PDF document text
    • https://kawanmto.net/contents//files/28919256376.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/62d66d0dc8b55efbd22984c0273b7345/wuleropuxupi.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tipilumolomodepiga.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jidowepojoruz.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108080511018427.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/hthtcpr91q5jfiqjvo60d2oi1e/kipusuxupajena.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/256006fd2aca83f6c31dde5657c668ce/52868322994.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/35761748174.pdfIn PDF document text
    • http://galerie-louise.be/userfiles/files/gelugizegoti.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/xabudimukowedenunekafodi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/81d2defd69e78253d341d6e2b2e8cb68/pifojozivogu.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210712_EF2FC49D39075BF8.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ee773634---57061477752.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/o26hmjc3hcka5h6b02tuorenvj/86715043082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wow+leaving+guidePDF 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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 15260 bytes
SHA-256: 19262f9aca725355b1cbe5058478f3b6f74d3a1162435755d743e3ea4740f83d
font_01_sfnt_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 10304 bytes
SHA-256: 6a6ed49ae17e0f6e6418c3e57a664a00b7898a2d0a18168f483a1dcd38d3ab66
font_02_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1