Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecdf57e7a25f100…

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 00:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1574b33de3e000e02d64bf0279fcdeb SHA-1: 2a2de81a6848311ab3514407a5984eda0594a6d8 SHA-256: 9ecdf57e7a25f1001f6c2cd69e44ee0b41fa9fb421a22d6367c9125c3083739f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://arerp.kr/data/file///tozixurazafa.pdf
    • https://inifd.london/uploads/file/sisowozapowifuwamivax.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bffa71d11bc9b92f8c1e3a6adc28de34/3485764127.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ce7d0695---bababebedule.pdf
    • http://parkhigh65.com/clients/4970/File/66640216194.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160947f2a1ec84---ladakujanonevawenexavub.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacb95ca24---sifoku.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073b41de47e6---37221290502.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/svss324b5hnogc9tvt3nh9g02d/telutezifibur.pdf
    • http://timnhanhonline.com/upload/files/51881523592.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83028e5b4---82774547099.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e1b0c184---73836508137.pdf
    • https://behbehaniprojects.com/uploads/files/minutovazazunoxuwelisobo.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/59db2bc1e03c5c8e7dfef8b465599921/19797190033.pdf
    • http://mynigaoe.com/upload/file/20210519134130.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/vlin1g1ooc6vra6be4jee5sfi3/nopigubexojutitefilati.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/04us1sjbpn6iblccdac47uqknn/zenit.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088d51b309e6---66813170489.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd900a490a2---tamimiloruvuna.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1hklel44lusj894aldg5rp4r3s/13590167423.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912ab8bc3a8---lulosip.pdf
    • https://foundryindia.org/userfiles/file/59193386936.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/j7p23o1ldqlme3jllccfe0m8ej/10386190848.pdf
    • https://susta.vn/userfiles/file/95417712065.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=harry+styles+naked+poster
    • 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_off0000f4ad.bin
4984cadb7d4f1d0b19a675098944e19718f43e128407b7bce35e26c1a5b10c54
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16940 bytes
font_01_sfnt_off00012085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 16792 bytes
font_02_sfnt_off0001389c.bin
20bdd03560c112a43742822ad53d4ac4f9c5b533e394fbd5f199e7dad64e37b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 10488 bytes