Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe6ec28df54d8bc…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 21:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cac5148470d1c8fbcf1c1cc99639c47 SHA-1: 3832bbcbc92cdde2cb7bce6c53005f59ae828fe1 SHA-256: cbe6ec28df54d8bc9b48e217ddfb228df365a107030b1fb07bc10f6d523916a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with known phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=free+download+manager+idm+for+windows+7
    • http://arch-teh.com/pic/userfile/pisogefibibegewadigisoti.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/s74edr7sji8977lhis0p2k5vgm/sidod.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/i2i2tpvjt3f8g87gi33g0iu5og/negumumesezositutaka.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/61454aefd4c5b0bb338c0ca1a91d9da7/gigagetowifivomosozagijaf.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/e0s3aad1ut18g19oomgpi8mbmk/basafidasubopi.pdf
    • http://mindatpeace.us/uploads/files/mubakizewojinev.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8043ce43b829f047e2a2059e88145dd7/toxubazumogalija.pdf
    • http://re-view.online/fckFiles/file/89328395144.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/safli7qjno4hsi9upccnrbvag4/vevosurazesumogi.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd137cf74---20545751778.pdf
    • http://davidlbrooks.com/clients/868292/File/kodogavejawenanewerukew.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6181dd5200d3bd0ac62b52c03ae5bddc/rogonokudif.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ag1ilfgq6doqjeee12vencbq06/32493154301.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/iq51fgun2n91r1orpmvq273jso/pibefoxeliw.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b92b900d0c5---nudadabulejirojewalivuj.pdf
    • http://meteosputnik.ru/userfiles/file/49069101180.pdf
    • http://portalcom-b2b.es/img/user///file/_0302648001620612419.pdf
    • http://kudusde.org/resimler/files/kikizevunidev.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ac2583iomg03mc2qi38t5ncgv7/sowib.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608749a59e06e---75946212333.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16096a59e293ef---5785169627.pdf
    • http://asianmosaicnyc.com/userfiles/file/31847327028.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160900dbc84266---65991787464.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdc533d42---75487409970.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e51535f052d1f713dbc6e62c3c4b766f/17879313275.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9b7f476a267eba314c09ac713b7d3311/79999496601.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8296b48c1bac6e9771f839a91c4da370/xafifepabogitawiweriz.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_off0000f0f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 16792 bytes
font_01_sfnt_off0001090b.bin
0c198e216cfcd26deeb69593c4c74d14d4afc4fce21c7dbe4ad58fa921f3a044
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 10712 bytes
font_02_sfnt_off00012172.bin
0cc7b83f86ddb456bc37975c4ac9a7ef42bfbd549fbdf67a81be91cbca96ca6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 16932 bytes