Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5b98b8f503c185…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 12:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9b119400d0e16a5afdafcd7f0a8e0d07 SHA-1: 5a9787efbe91ebc4082cb8a7bba95c162552d15a SHA-256: 5f5b98b8f503c1858c81f92bac40f6085a9c437dbbb9cd5cced6b01456be517a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=jaundice+in+older+adults PDF link annotation
    • https://zanhotel.ro/beficientconsultingFiles/file/94688929260.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/20534c4992a8d6da2814a0c91a450dc5/lugiwodisupenebiga.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf01a7b9f---jusisoxa.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/84243160241.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vomujus.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e62465e26---28832025991.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba42e6c61---97751677107.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/fowakolulovuravenupipuka.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/matafomofap.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/32956958612.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/97721277822.pdfIn PDF document text
    • http://midel.me/userfiles/file/42052425183.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/41472292948.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7de8d4d50a7f2659bd44d3ea31190c83/45587988265.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff20a6d01---30124771862.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7veul4br4bj62bs5lck9fo2oc1/lanunudi.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fo5n63c4t2ck1aragao06dnot2/tifusumupex.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/89471562641.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/51303646308.pdfIn PDF document text
    • http://carszana.com/image/upload/File/66007319929.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/tcooi752sgi7rn53228rimhpg1/xiseluwasibulesinoxowir.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aba59f177---58659093605.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jimvhnqe5o35fsgj0kream2l5r/15112378975.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/votaremi.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/levapuzudebiragu.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_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 10452 bytes
SHA-256: 568522af1a0ae0db1e1803dc0c99bec515e7d90f12ca50cf99888d062913fadb
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 17440 bytes
SHA-256: 058b76c2b7061831a808ad0d7a138d422775892d246a4e2a7840336404be2c45
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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