Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9ad86460c97936…

MALICIOUS

PDF

79.0 KB Created: 2021-07-05 02:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a004c576c7591e83840804c7fb13e979 SHA-1: 61b381cf4c4e05105bf06ec63aae1763054f2f8d SHA-256: 1f9ad86460c97936c408d4664c1b7da7d0a813f420ba6c11cf736c7376d2f57b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body is unreadable, but the presence of numerous external URIs and the link farm characteristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0ed2f12333592058f741b454eca11505/51547088310.pdf In PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/646fa28825ec9c729375983551099048/dabebidulebibejada.pdfIn PDF document text
    • http://prmakeup.com/Image/files/lisemuj.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/zotomuwirokafafirolikunuf.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0hpu6cs07p9559b6ns0m1pd2fq/bofotemakodolewo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cadd387ee---soniki.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/webijule.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbd690875---91843003213.pdfIn PDF document text
    • http://attlas.center/userfiles/file/800690504.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/srv5msabds26igkcfov78siorr/8265775357.pdfIn PDF document text
    • http://fitviewer.de/files/file/wafenuladunadiroro.pdfIn PDF document text
    • https://medtek.vn/storage/file/47709525627.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/54288149335.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee220c594---84772717808.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/83443270798.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30eff1120---fovokewamobudaxolana.pdfIn PDF document text
    • http://www.520amis.com/upload/files/61301588961.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082901f31b8e---70078706230.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/caf0dd02577362abb54acda20b1ea6e3/30871980733.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f78179af---sitegowudeloko.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zekeduresixaxalataribol.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c0fee9a3e7c4104ea8850f5c3abc0179/peposananeziposagavujuve.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/67326164178.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f36971362---xenogudedekofemopasifu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/94798959170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maple+grove+take+outPDF link annotation
    • 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_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 10316 bytes
SHA-256: f376ddb4dcffd2be52e44fbcec420c56db8c6a68a03be39ad29cbc748dbdfc6a
font_01_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 17704 bytes
SHA-256: 2831d011f2139d481b096add5fcf380f4892d741dccd5c0d68a5a3bf52795b30
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1