Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee8fb6d1bf91218…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 21:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f2e0eea7a76f4d1a52a617dab65a633 SHA-1: b3bd70d927d1969ffc43980ae03d20957eb01999 SHA-256: bee8fb6d1bf91218957f2b74b7c1f98e5054b0c6ca01f65d5644473baed39fa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cmtl.in/uploads/userfiles/file/file/60605750518.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0dec126d9---19321334470.pdf
    • http://hockjoohin.com/admin/uploads/file/79435792276.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vinuvunasan.pdf
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/xewuxekuxagib.pdf
    • https://jahanchart.ir/data/files/file/62303858341.pdf
    • http://855solution.com/htdocs/cljr/data/files/musezakasulixi.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/63786264391.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/xepulofisut.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/53207add829b2bdeb428065847b7b216/65184477582.pdf
    • https://soalmatematik.com/userfiles/file/36825566329.pdf
    • https://tgvl.in/uploads/fck/files/nifixe.pdf
    • http://c-six.it/userfiles/files/jutubijosuzidatofije.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/vatamokurezawovilasimave.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/balujepojuwikupawekuf.pdf
    • http://kehlux.lu/userfiles/files/kizovujafi.pdf
    • http://klwas.org/userfiles/images/file/posez.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/kasixuribaxur.pdf
    • https://cuatudongsaigon.vn/uploads/files/23984646153.pdf
    • http://sostrevalli.it/userfiles/files/64576557507.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea035d317---33020202616.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e362119a---25684688213.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1gpo06eel2bso9iq5evre29qt6/rinugexejimatufus.pdf
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/15291365822.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sharekaro+lite+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc0.bin
27af42f65e6c7d584b68cfabc931885a6d24cc98e6bfede828d06bacf6c0101b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 10428 bytes
font_01_sfnt_off0000f463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes
font_02_sfnt_off00010c75.bin
b7ee6ee033093d302d2a4eb9c5c748f210913d4121d24e47d37d25380ebd89e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 18048 bytes