Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49ccb8de9a8a824…

MALICIOUS

PDF

99.4 KB Created: 2021-06-28 18:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d61c497628d7428a0d058a66cced9db5 SHA-1: 25cc9f74df6ba58270b7f764c1d3783f024c57fa SHA-256: b49ccb8de9a8a8242a7e51767aa5ea6ba3a4fc261ce4f082c69df91e90db3ee3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://allamericannursing.com/userfiles/file/98994230116.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078441b85245---levaporuvajipuvitesusubof.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/magudemezufitan.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fe90ef0a---nemezako.pdf
    • http://cohensevents.com/clients/74638/File/gadugivovelokejubotevis.pdf
    • http://arohitourandtravels.com/userfiles/file/betudonidaj.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160943ac1a1b2f---58034008900.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/fegawigosanuv.pdf
    • http://unicaconsultoriarh.com/images/files/turevigekexeweniba.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/03420b18aa97f4ccfd61a0888639bc32/pusigu.pdf
    • https://anandamsanyal.com/userfiles/file/dajosadipikiwuwidebus.pdf
    • http://casier-a-bouteilles.com/file/72693299024.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/2b3abc2b902e0f713659c51c450bb2ae/67032679974.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799e44c6b28---81192504763.pdf
    • http://dgjst.com/upfile/file/42289199265.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2b47e1d1---6872564621.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0743f7d6a1---10664913071.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/04944c849b27b12ffc6f8417948419b7/namifapinaxefidujiseleram.pdf
    • https://robertbah.si/files/file/12779482781.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/35cddb25f6272bfe0a81bf5a6480a308/difuneworavemopuw.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e581d7a9d40aeca0e8a51467af30bd17/bejitobexe.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a64f85d0c---zibewudetevalarime.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210627_03FA3597C3ACC155.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c093caf638---zomobe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+does+the+seven+horns+mean+in+revelation
    • 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_off0001237c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 16792 bytes
font_01_sfnt_off00013b8e.bin
d3452d983974c3062985bb1a2f8b7256475b76c5271c66be3d790ad00059501f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8E 16664 bytes
font_02_sfnt_off00016690.bin
469dbc6cd2e9bcb91849ae304212a571abbe09637b493a5ca91c15db087fdf12
pdf-font-stream PDF embedded font (sfnt) at offset 0x16690 10572 bytes