Malicious PDF — malware analysis report

Static analysis result for SHA-256 4201b3c50786baf2…

MALICIOUS

PDF

90.7 KB Created: 2021-07-29 09:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c06481c34b5a2ad129197fb4db579bb SHA-1: e000ad87a2b948a3934742efd2a47ed7ca4294c1 SHA-256: 4201b3c50786baf238c4cfffe78e15c9c44e2a6dc695ca245556e2a41f9d1960
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains an embedded JavaScript stream and a large number of external URIs. Several of these URIs point to compromised WordPress sites, specifically within upload directories, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/90a8915941816e3f38cada4b1e315895/27631199917.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4dc7bfe45a0b883eb76d821bed7bbbd/34797609491.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050506112831.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pobas.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6e0322fa---90325249935.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/714067625.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/93735147563.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/8i40l8ta3evd7tcd4d9bmg3qab/vubajuxotogizexezigax.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5d0327ba---76075682079.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/dariwizajala.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/boloziwikitak.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/xinivawewefimo.pdfIn PDF document text
    • http://lovesenergy.com/file/vexem.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0e7ec9ce76d4cfee837dec99101b9c59/72235284431.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/gawijem.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786687ceb0d---tatowopitemoxelagiziban.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8dd3387be3d38177673452c6c232ff2b/34412684812.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608866a478392---96776024688.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/difuximusano.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g3fssqjlicnq54ad4ak0psaah6/roroxelutujofaliwirolexed.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/89974250038.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/pisorelure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=resumen+del+libro+el+murmullo+de+las+abejasPDF 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_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 10728 bytes
SHA-256: eb73cca2c3c7cb1c86062c4c5a107df3cd44e5cda5b7c7bf39aeeeae295f9bdd
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 19028 bytes
SHA-256: 4235669654889a2b71b2abda1eabe2c06cd602349e51fef6fa795a927cebbbe4
font_02_sfnt_off00014353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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