Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d120fd09cf0bbf…

MALICIOUS

PDF

90.1 KB Created: 2021-07-31 21:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7beefa2974ce568b4b1c69b1cfa935ad SHA-1: 98e018440523f150174c35c145148a2f2f5ce020 SHA-256: b7d120fd09cf0bbf2cea99dec65e125abc78ded0f59bf4b2aac4d0def1ed7efe
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document contains embedded JavaScript and a high number of external links, many pointing to compromised websites or disposable hosting. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload via the embedded JavaScript and external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=battle+for+middle+earth+2+patch+1.06+english PDF link annotation
    • https://imahima.xyz/js/ckfinder/userfiles/files/mifufid.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b29101ccd---26940398712.pdfIn PDF document text
    • https://fallsplat.se/file/89359949029.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f7278a6173529eb34a590e0b53b85aa4/jumaruwojitutebexufeg.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d47499e6b4b---nejetowewozunadelizimak.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/segulitobomiw.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/17e7f3dcfc09ecb3d316025683286781/888737444.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4f98c4c1---38344670076.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/ruziwemulemo.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/23065892835.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/44557264311.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/990f7f3b27feb669d1f025d8e5321fc1/bigabazefejofotajeted.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k1omaj3n7epink4634vufkcia2/zuram.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e78220f6c5e47982888d7d1eb17fafae/jasutarolalujogaz.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076028f0fca1---xagaxavod.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/bidodibixezunitalix.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/212790e9287a46cae81edc47908ad112/dexuwasafumalizev.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/65827520279.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26bdcb4b33---sijonanivewirodosasewasox.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba07ed3e23f---37555985307.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/guvigobuvagojexijof.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f08c2653220---mesuf.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6vhe20m0rnp45fbo5l3k280nt7/58434534085.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 11648 bytes
SHA-256: 1a600c76a03c0fd8632de9aede6c0a97d511a971330d091a76e3e720c891ae94
font_02_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 18008 bytes
SHA-256: 02c7c6941ce653d440c24872a10b0ae5c9551a855ffbb7c2b78be0e00024a4b2

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