Malicious PDF — malware analysis report

Static analysis result for SHA-256 4862047e37a7c7a1…

MALICIOUS

PDF

92.1 KB Created: 2021-07-17 08:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d4fe13830cd4f6a2b2f8e2597ad20a2 SHA-1: 7216270b69afbdb65dfdcbd9f0608a730f8df38b SHA-256: 4862047e37a7c7a184f4cfb0bfd84e156c424960515d065d05d23baa313d9a87
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://reikihaus.com/clients/75291/File/16751883709.pdf
    • http://akicgiyim.com/userfiles/file/wujokiligulani.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef45c084c1---dojagomowaz.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfc5ee54b---kepofurafibogijukowe.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0bf6923a918acd5af1746ceb7c4e2476/togisemakomamoredulebaxe.pdf
    • http://aryajob.com/user_upload/file/junijafodupuje.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50af4f6ca---fuzakavarewakid.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/gegufumenuturu.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/sexilikabekuponu.pdf
    • https://buyafranchise.org/files/files/20118069065.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ffcb54449e2be6921aee311c1bfabe13/20936844426.pdf
    • http://amy-tsai.com/images_express/userfiles/files/wekitedazisilipagibevafi.pdf
    • http://pileshoppen.dk/userfiles/file/zasejibudezekeliwo.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ea580fb---29505117892.pdf
    • https://makenie.com/upload/files/bepifovikipozavobezu.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/374ba20ecaa7ad211602efdf580749c2/70807339736.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/91815445409.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f95b39eece---rojoxibumekogarikeru.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zodudoz.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6f84bb5534965c1c1622e44d2fec7e97/befozibubusod.pdf
    • http://usmleworkout.com/files/file/takexesibifejobebe.pdf
    • http://buddhavehicle.com/userfiles/file/lujurosa.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qs5d2n5k5tm4ofmlq9feh8v295/20364385063.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=anime+site+free+watch+and+download
    • 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_off00010551.bin
7b077231724ddbd496bcfc7f8712620686cea8736ae02bb4c8b5ea15b69f3027
pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 17108 bytes
font_01_sfnt_off00013226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 16792 bytes
font_02_sfnt_off00014a3d.bin
61f3181c220d8dd89ce8cc561173b472e7e73f85fd27b583809baf9aedf6ecb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3D 10808 bytes