Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d0bcbf900eded9…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 21:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e9b2bba445cfc03621b6c5b611ccb3c SHA-1: 703c3e9041e704cdb63a226577377263344a9dcf SHA-256: 39d0bcbf900eded91bc71664ed7a16cbea39375ab852e6777efd78ecce76d31b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a360b3ce8e3---24131723045.pdf In PDF document text
    • http://teedinmaesai.com/user_img/file/39036237608.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mubikikolodonelugovizivif.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116e42232b5f---61061906439.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/14649022867.pdfIn PDF document text
    • https://actorconseil.com/files/file/femetas.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/95742031609.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d66f787641---pejosubuzabaxejoxu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b582c924a21904040030736d83a9923d/ginawu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/golum.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gekebozeluferetubeduzote.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/guxegepiwijujirapas.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/junuwufozosuvud.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tsdnpjbssn7tfokuiudpsoascm/winusikudod.pdfIn PDF document text
    • https://guijek.com/userfiles/file/53857549957.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202108311051212000.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/4127b24b57a7f3b179d381f29dfa9d74/pebazofugozagositup.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb59186bd---89477890157.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/8831147037.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9e88ee9fec008f1be57c5edaf722053c/merokotiwokogamu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/24096511404.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/10049028072.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/32194217859.pdfIn PDF document text
    • http://lovesenergy.com/file/pinekew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nuclear+physics+by+kaplan+pdfPDF 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_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10920 bytes
SHA-256: 1ede58f99f8995607413af1f8dad7384f4da5783d8d019be57e8d74d231f53c5
font_01_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 18268 bytes
SHA-256: 730cee524984aaab32ec03ef3b9716752cb687e8499a5a56f3c0ed8619871af3
font_02_sfnt_off00014d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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