Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7733d265d5399ca…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 21:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0b54530c912cbc8ee96b4bf628958f8 SHA-1: 52f29eb42c78c67c8c9cc4c0b110d9538d1a5c34 SHA-256: a7733d265d5399ca8529926b289c3285fdd4750b34936b1cd7627c9a7f8a3948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=comedy+nights+with+kapil+watch+online
    • https://luminex.pl/upload/file/jetaxilikezika.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7fb0e6a6d47467fc9dcc09366eeee82a/67886712588.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3c8kitq8kvhs3ut0qa2vng7rob/domudegamimuleba.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4392ff1c4e0c29f78df1492757f1d873/guxupulubixotudumi.pdf
    • http://www.findvoters.com/userfiles/file/zowimolim.pdf
    • http://nfrostov.ru/upload/files/7382396824.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/57abea119a994a521b89ed5f74a91c97/garefizuf.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0766ded9e---kobetaworojerubeba.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/26325914896.pdf
    • https://nnt52.ru/userfiles/file/bajinilozub.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160701eada37e6---bifuvum.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/aj3p06fmu5u7uvr76mapedqqd6/56046886132.pdf
    • https://protradingindia.net/userfiles/file/vimexolotajeg.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ja6k83hlegprhmjg0971gc7aj2/nefis.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed19491ec6---10175747471.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa08eb8f2---jubokuta.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1b1ed783613143d7be4bad9c96d50ab5/52675504406.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a4b37d4e---fawariz.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tj4d2kk2kgjamrkojhdl1e31u1/bijedogo.pdf
    • http://royalgoodviewresort.com/Uploads/file/gosewimulefepo.pdf
    • https://chupwo.com/editor_upload/file/domuv.pdf
    • 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_off0000ea04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 16792 bytes
font_01_sfnt_off00010216.bin
dc2905dc11554ad65de270c650d272a32c8fc26a13ea5792f76c47bdd811790d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 17400 bytes
font_02_sfnt_off00012f86.bin
1d498e5b5e0f347f96f01fd7a588fe0969f8c044b719d1c1464bdfed2b64d2bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 11184 bytes