Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e793f5fb999a43f…

MALICIOUS

PDF

98.4 KB Created: 2021-06-25 21:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd958822b76866a18b733f0d3cd0f0f1 SHA-1: db82d48fa7e69c3637f19a6d81b410468ab1ebbe SHA-256: 4e793f5fb999a43f1006473782fb803f99698e7629218aa587be3c71b7463e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://crewmak.ru/uplcv?utm_term=i+see+dots+in+my+vision PDF link annotation
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r1ft596g8l2jafv2d21m5k33ec/64537539172.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kaxusajawaga.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/77ir35ehsb9q4lrnt9tibfhdcp/20551388166.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/349fsdrl5imjfie46sboug69ff/degeko.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/909c64791470fe81b13f77468c975985/risomomotajomanaxodevan.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/38960073769.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a97757743bb---79068747289.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607765a5d0f38---dekakufusap.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/sknpftpk45btq7op38hrkbe91e/36094888465.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa19ed0a29b---75530139058.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/58984343487.pdfIn PDF document text
    • https://ksboutlet.com/file/files/53980719516.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7f50eeda---9464661692.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb2dd9e8b---wiwufojisagukifozuwuna.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff793a096---magobigojafoximawixilu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160823c1a4646b---82161492952.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db552e880e---63043711145.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607548ba9ee97---44518165992.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/zutelunew.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/feabfbf19bedc8b4edea741567b9a1f0/salujid.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52cb75f6c---76143549043.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2cv2ja7g2lku7aihkj58rb69o/36287214760.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7c4b9a62---wogodilo.pdfIn PDF document text
    • https://termoformat.md/img/files/37519535509.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 10232 bytes
SHA-256: f6e61287b87a45f350c52712e768e6294f57ff78acdbfb640e3e96476a705f09
font_01_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 17996 bytes
SHA-256: b31d6bce2c6717546fe02be4850e615035e3c74f83e1ccbcbc591f365adbb07b
font_03_sfnt_off00014dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC8 17948 bytes
SHA-256: a8a9a65dc614ee59d3d2ad62066e4c8675ef6802bb0d6bc264448601448bf582

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