Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef44409bdcb7b7fa…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 05:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6f150de7f758540162af56c75645a497 SHA-1: a8b7105bd971c537a464968b997e5c6ed7c6363d SHA-256: ef44409bdcb7b7fa22b1320e059ab033e81b7a06df508d68a4a29c540f3f1d64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+connect+fintie+keyboard+to+samsung+tablet PDF link annotation
    • http://www.aamuhsv-madisonalumni.org/files/files/7715726759.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/natumex.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eb4iepi411l0j1hbc0bette590/20245477477.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/88219045145.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1610afeac01eff---46394981207.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b8d1af63d40a040233ee149cb3910cc8/9591061445.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/19932813014.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/xeroromasogasamudebizerun.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/zigekamavezomu.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/tugapirepurevubabu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/83485643408.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eda97e4277ba68c8d5ffac860791bbc5/ridofixarove.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/67479a6d2a1c4d24ec9ec7c1b5211ab9/jevojawavik.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/84559238464.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c62c2e0f23bd4d07aead98f6f5111625/58434569842.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a0d52939689e1e5eef634b24428d52f6/62058140796.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa0617d348---78150498066.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d001c1d887a---69603915769.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/4400920486.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c504c6880fb3213e168f1d2e332dafa7/55704276876.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210620035653.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/873f579024b9c514337bdf8c702acb92/xufokulogumenufavazofole.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2C 16416 bytes
SHA-256: 846a2c40d8c16ccc10d7f71e13ec2140dcfdb0e13bad03a80d42045d07a56b93
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 1888 bytes
SHA-256: b1f1c3901ccd6bc46a23978bffa68185b2a7764e55c34ded8bed69e910fbfc08
font_02_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 11344 bytes
SHA-256: 68f8ef2514c29832fc552cda8cd5e1a0cf416ffd699550d63618ef62b652e5b2
font_04_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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