Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc423cb31d16b19…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 00:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 90d1816181c76915d9623460efc3c561 SHA-1: 02f0f12c011d1f16973fb81a29f6471d74342748 SHA-256: fdc423cb31d16b193ec43e1897c7f0870bfacfb0a083958d3b92a1ffe47f7037
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and potentially malicious files, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://firewheels.pe/userfiles/file/rowefoxe.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/baad6cf7a6738f7fe835b665e5aea7ce/60283840208.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/57652602794.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7474c13060a9a6ecf57f1b6661e8e95/zabaxob.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/14193524758.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50f143030---74533641293.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/65865267838.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/19683984458.pdfIn PDF document text
    • https://nls.vn/upload/files/waxavojupozafizaperol.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/jatalorasivovanarol.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nukevujoxokimamad.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/39b0573766c50cf531f73be0daaa75fd/zalem.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4adde0a22---mukixawolubadikomifewatin.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/fedulokimu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rifivugagapuwo.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/712ae421e61bba439690282edffe45bf/5858388617.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095ea41df382---wuwejuguzulimafedazumi.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/88778476117.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/38658448084.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/19532579716.pdfIn PDF document text
    • https://cecprint.com/images/file/minikidozunowimevomusadew.pdfIn PDF document text
    • https://topupdana.com/contents//files/70626528917.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/5146452806.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e47d420c24e93c401ae6715365571fba/ranedowej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=student+exploration+photosynthesis+lab+worksheet+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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 17016 bytes
SHA-256: ded2e9ca8c419fa3bc9b5bccb38c1e740668a791ff0f51f379e916a6d303d3e7
font_01_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 11196 bytes
SHA-256: 64271b59f469132e7efea2989294d938b0d769a198b808eb7e2797dd8eec5bb0
font_02_sfnt_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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