Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f99108cfa7f999…

MALICIOUS

PDF

86.0 KB Created: 2021-07-06 17:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e36e45baa455d7dfa158ee412197974 SHA-1: f836aa78e1ffa7e4e70d96823db7d5f739249d7c SHA-256: f4f99108cfa7f9999161648cc9ba7f0445b2b2868b06ff3d8a618d6dad336363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9e5feb47a1dd13fcb5b0455731fd574b/73758684614.pdf In PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210704131050.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-26/20210626162835350819.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca53526d65---xomezusajumovow.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e944279b---zobowakonowagusigaz.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/75nvmau7c63qksdft45v5k0pf5/47887591647.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8011bc08b280622a5ad9fd020cb9d346/86819210629.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/3588146950.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/44728809022.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b050bc55f---40993858293.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/89c00345b0dc30ee29ff1af3f0598a60/kedenenusopi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2fe22adcb4370ececa65fc26aa49f157/gedagok.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sokizogidiverorax.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c50917a63---5138684943.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f532c2413---82031838630.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608230ae031da---mifugix.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/56128388068.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/lesisajevev.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/ponamoxovuxifexo.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/wututozizuniweli.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/33888237482.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/94327620596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+football+betting+tipstersPDF 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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 18264 bytes
SHA-256: c2236090c04e40cb569dc5abab45f3049ceba007b231f96c1e2deda3e92d14f4
font_01_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 10652 bytes
SHA-256: eed90237e11bd310d0015ff53db6a2b905f2d2b36d13d669ec3c145896832366
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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