Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b359394e31c5f95…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 13:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d6a5ba427c9eee5c9e633497b96a076 SHA-1: 31796d1245c76a352cd25d9ce0e4ae00da3aab4f SHA-256: 5b359394e31c5f9504ff7690c66faf11eb29b2b5b79938c6a33ff56c10b88922
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm. These links likely serve to obscure the true destination and distribute the malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608007ca7295c---jedanodolivotepad.pdf
    • http://forter.vn/hinhanh/file/bemilajugevupewule.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d004bd801---36897320588.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/7365017797.pdf
    • https://autosaloncenter.com/uploads/file/81346023283.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082409be4758---14209045863.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/2rqhftrju3mlfvkdgrqptjmlve/momalijobuwudederuxeti.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa4355f7b---baxilasopebakusogasisi.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a291bdb677---nipofovotufepeda.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/kv7ito2gkt03b9mqgb7acnl4oe/19208174610.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d1c502a4---73570320480.pdf
    • https://bonacorsi.it/file/vokurizox.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/08bd568b4b9dcb242627660281c6e943/josuvoxabif.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd00ebddef---52059243173.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8126aef827663c77924601822fd9f1d1/xigokasabozidodet.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d07e02974d03546c66c2381197c1b9ea/xewuziladewizuleful.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052657d7aa---subidasojuwozeluki.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160748ab124cf5---bajijusotojukuwepan.pdf
    • https://damiel.eu/userfiles/file/kudajiwodibibaf.pdf
    • https://jaiminsales.com/ckfinder/userfiles/files/taxajufumugepapevo.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceecd96577---pexono.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c788923ea5---razaf.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907aa902e44---tapatediriwameve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=beets+and+coumadin
    • 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_off0000fa8e.bin
c19de93257f2613ae0354615d7b50705ed08c3975291b4a9bcec2f6d81c79bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 18016 bytes
font_01_sfnt_off0001295a.bin
c83043ef0dc68a074e5cebf61b0c01060f47495445e84e2c24c447662dd04a41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 10540 bytes
font_02_sfnt_off00014165.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14165 16792 bytes

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