Malicious PDF — malware analysis report

Static analysis result for SHA-256 212d9630e7a3cc87…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 13:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f90737291b514e465e4ee9a290f98d3 SHA-1: 9397d064bb53fcdb613a3c02ac278a46439182b0 SHA-256: 212d9630e7a3cc87fd3271ec72f51dc92350b4faaccc98b34be00c1359484377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070207245567---kifimupubin.pdf In PDF document text
    • https://maisonforville.be/documents/file/84405639751.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608734e0c2089---31680692304.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb466b4365---12271303653.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/19506480605.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/55845584828.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/vesujopa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081478fb3f93---14046668992.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/3597576830.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0d3699cf024bb65e4933e6184e7b8c5f/dotibuguwufurufilupij.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/13031562961.pdfIn PDF document text
    • http://flomojapan.com/upload/files/dapakifafipafesit.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/38480161435.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6kibb7tep7pj55rgafk5h3js4v/konoxakatanijuxoka.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/58415591079.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/76886254516.pdfIn PDF document text
    • https://actorconseil.com/files/file/ketolewiraparavutufamoz.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dasamulaboruwe.pdfIn PDF document text
    • https://laser123.com/geektic/files/rifisetudekovazuruzokev.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xoledet.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/97275369740.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/7boktdq2nbe089sq613kl4m856/fagixusitubula.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e3450810a44---fisinexenifoporotu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/051087c8c41626ad6d4451a84722e493/gamupapejaluxilulun.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cf5bd407---39125108690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=solving+quadratics+by+completing+the+square+worksheet+answersPDF 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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 18752 bytes
SHA-256: a754f68b0d9ae3b1e2f4a6a6ad318eaaaaffcf0faa7ef817dc4ee9e2d2d63687
font_01_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 11780 bytes
SHA-256: 11642e6540dbf9bdd5bab72fdd086b623da1ad0c24196ea5ce568068dd916de1

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