Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a1d263a3fd0fcd…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 09:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27ca128190912427dc2c389e4777ffb9 SHA-1: c60e51ee2cf4a528c3880c6f44fa4b12bfc98c8a SHA-256: 19a1d263a3fd0fcdd9704b79e07f40a47906325150b1c475b851b9687b1d3e19
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ancoraeducacion.com/images/nanopexu.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afb321b507d---wutuxinoxafinoboli.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/sebuzibamolaxolebi.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8364bd1cd2---22623945398.pdf
    • https://landbondcorten.com/attachment/file/822f2369630b28b1e4b6ce5fabe14965.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b5b8e329---jabujuzasopatisiw.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012773410e---vesuzojuvusoxixija.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb487e613---xaneko.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a182584f843---84979799219.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/eb36ae5e33c215a26485db90212f1760/98750634098.pdf
    • http://www.nomorcantikjoss.com/file/7730611527.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6dc1ae1545e591c50bca41affb75716c/10788487443.pdf
    • http://sevimticaret.net/userfiles/file/15062644638.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2d917f4c---42042274063.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f8f0u5hcv64b0so2osbg3lljr3/raxusixixu.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160adc7431e8f7---81552058472.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/m6f5iofmuue7uql6nna3k05i9o/fidikikofenazunabosubuw.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609842111b97e---26096987855.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9f9f7680a962cc1b99360184647ba03b/fativedobopoxorevavulofe.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b941dd1259e8b8050f0d678d65bac195/zabokusozoruxuxato.pdf
    • http://ok-poland.com/userfiles/file/82087703379.pdf
    • https://narimasu-chintai.net/jcfiles/file/60060447068.pdf
    • http://ahcxdq.com/uploads/file/290747009720.pdf
    • https://agmatbaa.com/upload/files/28987670641.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lochinvar+poem+questions+and+answers
    • 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_off0000f0f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 16792 bytes
font_01_sfnt_off00010906.bin
dce56417e82439eea47a2cd2d0ad167a20f0acffdf0f94f4d683bc9e6828f7be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 16756 bytes
font_02_sfnt_off0001347f.bin
77366e8f0cdcea1d06ec76bb7815169302d03d5af4b1ba49b0fd1f3ddf813474
pdf-font-stream PDF embedded font (sfnt) at offset 0x1347F 11088 bytes