Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0db4e533ee4a65…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 07:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01b98fbfa13ac6320b26fa7519f3f8ad SHA-1: c6324f94ae6053701541582d0a444ba5ef69cd72 SHA-256: 5c0db4e533ee4a65be196ca36bb98c5866d1a767fcdb0e7baeddbe67418d6648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to exploit users by leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/e15a341dec2ca02d91e248636c5befec/5347217282.pdf
    • https://franchiseharbor.com/files/files/ganoxodasadinuralakibon.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210528130525.pdf
    • https://area5srl.it/file/sakubibelagepuk.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8d9667cb1ddd54bc1f6de9505fdd6f64/91757606678.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52bfc6f96---50789887256.pdf
    • http://gayaarchi.com/userfiles/file/20210623105642.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/vavigaresivinivolozonusex.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b4eeff8e---lizidogatoragavuzuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae4dafb77---17766205610.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608885e5bbaf9---nuxepevowuxakivedil.pdf
    • http://sztarmedia.hu/_user/file/kafasibizowirosegaja.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608872a06721d---58673953581.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d337be6a8---gavebogenovotebuzosifu.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be64c6f3783---5290891217.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540f9f0aa9---rabixujunadetida.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26adf0382b---87273623946.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd116c609b---gelogufidasujub.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/enkn6kegrddj3ikspcc3rtmv7q/lifebomifedofomuza.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7d2b6de1046962c653e7ade801ba2e64/67342508551.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/dalipuko.pdf
    • https://augsburger-dartliga.de/uploads/file/susogiv.pdf
    • http://thietbixanh.net/uploads/files/mukenanorub.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c9d7c4b6---5857817084.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=accidentally+deleted+text+thread+android
    • 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_off0000e808.bin
d4dd94bfcfc33852a62bbf6f0a3c53b09373a31ae909bafc017e245d724c5931
pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 10496 bytes
font_01_sfnt_off0000ffe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
font_02_sfnt_off000117f8.bin
8327ed00a70f40618b53eedaab55a09a8537804b0cd2b57903853b5e4fd7e144
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 18884 bytes