Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dff9fa74f794281…

MALICIOUS

PDF

101.4 KB Created: 2021-07-31 08:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5630cb6e17460a4943e4dfa259f24183 SHA-1: 27f72eaef89bd8bbecbbc83f08541a0e3a567700 SHA-256: 3dff9fa74f79428106b14adb960cc7d2ec28a6c55de6037c4394adb12225fee0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16077670ee031e---joropikofinevosom.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3u31ln0kif0jenv0hf4sjcvj9u/lajilusipowinivoxu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cadf496bc42---rakowade.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/59204230500.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fijovadatudeta.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/anodg5nv4dgjsomkjf4jg1chq5/lagukatugiga.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d841f7e5e56a6d63120b9c7db9aaa112/kosepewamubujuvet.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/17943419010.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/5k3pahd8tqse715ijc4abgmitd/xebotamix.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/aac1058f018ab7989b8ff940bfca692f/wokokewilosowodoruna.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/37127eae767aa26ac88a9b16225d7e7c/33662320648.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/sojanilagojuzaxasaxuk.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/babobanuzazoxuriwava.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/76007286916.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/35fa1330256ac3ae8af77ca1507ad217/26347449068.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/56975623242.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/xerenuwolezeka.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a968768054f---42844157971.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nakro3i7bqqs7i6ib9frivknm3/59313807979.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5d95e79a---74012305658.pdfIn PDF document text
    • https://x-software.cz/data/file/bubozifuzigajoj.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f3c806c4---xaxirumifiwefabuvenake.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae97e10d07---59745662539.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed80152f28f---waruwibexoriwa.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/menawometamowakase.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/zefamaxulapegonezir.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/velasitakovuki.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/96442589809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chapter+12+dna+and+rna+chapter+test+b+answer+keyPDF 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_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 10988 bytes
SHA-256: 39cc97e826c54560405baf051ad3f06f5ecab1f71969417652919faec8c224b7
font_01_sfnt_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 18524 bytes
SHA-256: e36a96cc52aa00ad001a304111576ac6f0c048d79ea01e6f38d6367915ad5138
font_02_sfnt_off00016f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1