Malicious PDF — malware analysis report

Static analysis result for SHA-256 e233fcba38d5a617…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 18:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18d57ea67598d661d902a8758bab05e0 SHA-1: 64936f5b8adf03ccb7f977e966979b9549d9fc0d SHA-256: e233fcba38d5a6175a1edec35b8aa35ff79a1b52d40723842da8935c6746110c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a57ae3ad---jewikemogugep.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/nuxusinageroxevepas.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/lodibiwafokaxepira.pdfIn PDF document text
    • http://ezibra.pl/upload//file/bagazupunagumemesetadebun.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/lajugutamalikikofa.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/nixaridiparigatam.pdfIn PDF document text
    • https://brs.jo/userfiles/files/20014801368.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/dinaguruwuvavut.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6c0e1ef090ba8fd4511431cfe2b6f54c/webolisuwofovuleputod.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ujmet4ior6lf1avunc514ffrik/mofuf.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/2c09d86519cbe72495df97a7e3d66dfc/sorife.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/72820009365.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3d0005871---20402339037.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac130bc32e---51383545942.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8d8aee888---63665566694.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/80f55827e028f5305b4c9a7d6341c669/zutizereteduvewuji.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/fexibusufuxodatikabevanez.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/bepixewovokatitenakuledat.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16108e6d39851e---6766386202.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ubssjommj82o41i5ih7bo91ti2/65893747454.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7218c544f24cd847df12933cdf259397/fefonu.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/nuwevorimigemijebozaf.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/33055845812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bsc+medical+zoology+book+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_off0000bbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16868 bytes
SHA-256: 85e8779a876db3a70b27970bb3e9c4af7ef2eb5000197dac912cb955f7403d72
font_02_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 11120 bytes
SHA-256: 2cf23ca7a80365aac24b7c721d937ca140e67f1281576caec33cf5b8e95baa6f