Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e0efa2e9da8413…

MALICIOUS

PDF

80.4 KB Created: 2021-06-27 17:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84b87c6b057642a000f95d2c3ab1fceb SHA-1: 379a56ab08187b8ab0fbe0f360e148ca79fc6f40 SHA-256: 85e0efa2e9da8413b1a71e21d8863cfcc4a86be7b086f79ea3ece43d54956afc
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm, with some links pointing to compromised WordPress uploads and disposable hosting. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kondicionery-krasnogorsk.ru/upload_picture/file/pobenofu.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ca67fa1f---99722053947.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/76dcd0483b116a789b685392302eb075/18333590857.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3f7cc87de5ae4bee35a380e6bff7bda5/934245468.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dc5bd742592ab70a522d1952f2f238c7/1385685480.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7p6p713ct399s05qv3da4gf3fd/90521534676.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9lnhggtj96d1jhbiogqpije4ss/narelepesev.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89b82b005---43450166373.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/05qv6ven1m0j7h7nbl0lclj35k/57244829006.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2asluds3051j4br0bclapr4777/3656382077.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce91eb148c---43933597665.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b048ea08b---96443331774.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/00m2s9a0arssvro631kaohpus5/72619797009.pdf
    • https://yalcinplayer.com/calisma2/files/uploads/baseditavipe.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/juliligam.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/09mtcpn3flodtljfkc5tljkn02/vagekimibalid.pdf
    • http://157.230.241.115/image/upload/File/74412769614.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fe2caa71b212d73d34f431e1844071f9/nulegosotevotikap.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/09b7ddb5152b081b3b4b043e25691bf7/xuzojuridugeloribuvusil.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c8a75e93---lebazilekamojilaz.pdf
    • https://alihuata.com/userfiles/file/motuburifosofixuv.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b759ec874---jevutat.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/28naj6bfk26slvlc1ivc62mpbu/favukovewalufago.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35dd48e5a---49032999724.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090489ba39fb---vesigatir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exercises+for+past+simple+and+present+perfect
    • 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_off0000d5e0.bin
2413e1281a7c43a1d4e7397f2af032df0732ec90d92330bc3aaf86416b5cb26a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 16588 bytes
font_01_sfnt_off000100f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 16792 bytes
font_02_sfnt_off0001190e.bin
017cb05d73085409fbe9e4074ecdff3466ce0715649b681723c988b8a4463486
pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 10868 bytes