Malicious PDF — malware analysis report

Static analysis result for SHA-256 7628597f713d3080…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 18:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1c77ae4acec688994d6bd19b783a9e5 SHA-1: c1d2a3d8c90b424b5968154a19ed0fbbb9f0ce48 SHA-256: 7628597f713d308032383187880ba1e33675e739852edc6ba6a22685866b6fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The heuristic firings indicate this PDF is acting as a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=apocalypse+now+online+free PDF link annotation
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/21cc694cfb33ec9512faaaedb3e58fec/salepobikiziwe.pdfIn PDF document text
    • https://ysh.my/userfiles/file/purudimamukorowo.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vikopema.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f015a3ed25---71362061232.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/4724428920.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/zefuno.pdfIn PDF document text
    • https://digireg.org/upload/32797289662.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xisesobobenowajipatame.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eda4c17dc---9931459340.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/mutisanofutoxi.pdfIn PDF document text
    • http://turatabor.hu/media/33344524458.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/fusavowuvolafuxezewirag.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613461b7c62be---73261334262.pdfIn PDF document text
    • http://armanetti.com/images/rodigi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tumejamojuzidebilu.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lelubeselezijenib.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/59153344203.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/88634889810.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/daluv.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316818a3649---zefekomupedajoku.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/gabafusivutemixipobanox.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06eeb25c9---fibedisokun.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/62637947411.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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 17464 bytes
SHA-256: 44d5b4f664a32d87ea5961481c2652ac3650a4f428f509f0e19aa80defb296c4
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 10556 bytes
SHA-256: 9254daf58f3c9178a2bfc5c97f889ea74f0b1e51db1c29af829be2dd88a3f8b8

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