Malicious PDF — malware analysis report

Static analysis result for SHA-256 570f3c6dcd33d73a…

MALICIOUS

PDF

98.1 KB Created: 2021-07-03 19:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9006d33af64d879d6eab0bc26d639ac6 SHA-1: ec10ce5e4fe4927dd2d60fd8272e3d077a7126ce SHA-256: 570f3c6dcd33d73a36bef1d171a618d28d9fbde044fc022506d1ebd4cb829b22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains numerous external URIs and points to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or further malware downloads. The file's structure and embedded links align with a spearphishing attachment or a malicious link delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://crysiq.ru/uplcv?utm_term=popular+town+names
    • http://netisiletisim.com/guvennet/resimlerfiles/55299972250.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a9144e6198a75e07f2f451fcd5c8a956/zuxula.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c33366be4424bd49d4839a734ec6872e/novogal.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bfd7d5620d0a5a1793c4c13200b6f541/tasakaxulurosukubamu.pdf
    • http://srividyaastrology.com/userfiles/file/janilekavifewoxokizadex.pdf
    • http://ghalemdi.com/userfiles/file/61192836289.pdf
    • http://learnersdigest.org/userfiles/file/mavabipefozofenifevina.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7141d575d9---tubonowuve.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803ba52de04---60248234188.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v8gacmcannl3s52pbqcvd9jc52/xotifinibapevazivapuvut.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce52c4ffdd---18920255775.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/aj68rmi6bqpsvr3rvf0d1lgebm/4371713650.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gf5ffr82eqoqj73g6gb9qerpqn/jomadonokabovodevob.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/edlljgfpu9lrgj4kv38i2v4892/nadexuvigomu.pdf
    • https://bocion.com/ckfinder/userfiles/files/98145270063.pdf
    • https://implant-drill.com/userfiles/file/84426821156.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/332206c8d4fcf4f7c191078292ce0532/38135110002.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/96d89af139d18731138e971000ebba18/49044338228.pdf
    • https://activepymes.com/pub/file/mosujedelogeken.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/52b6020ee6e192e3eb3cb3008b59a915/83613022347.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609716c53ac50---sedefigip.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e80ad3a1a---80626846283.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf20bbeaff---somusininezofi.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_off00011e12.bin
bee7e6b176ab1c37e9032521673beddef6fd4206179518646cf594ca6d12fa3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 17488 bytes
font_01_sfnt_off00014b56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B56 16792 bytes
font_02_sfnt_off0001636d.bin
4ff3cc326c152888b92c4a6dbab66c6bd4bf6150ddb8a2b558cbaf345f01419d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1636D 10508 bytes