Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6de31d24912f81a…

MALICIOUS

PDF

90.1 KB Created: 2021-08-15 15:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf9c198cbc11b1c281faff0bee52cca4 SHA-1: 5b84f80829664f9b0b0d62a0af0ebfb2fbcdb436 SHA-256: d6de31d24912f81a18f9f90c262084a9aab83feb3fa0ea3aefccb206a5f9b76e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://catamma.ru/uplcv?utm_term=is+there+a+blaze+tv+app PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa92fc2108---57805665725.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/61302422371.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc260abe32---vateku.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/79747835832.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/8955200895.pdfIn PDF document text
    • https://energooptima.hu/upload/File/2994087412.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/lemigifoboxurojul.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/i3lqnc2321mdn7uv2892nsa541/65448879985.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/zemapinopixuropekizipunu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18bc8c01a---71725621262.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/43414907873.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4ed1852da1b3070da6c25a9885ce9b8e/32908406334.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/64736565718.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/87353199171.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5d963c66767f224e64887374e2533407/giwofelobatamaju.pdfIn PDF document text
    • http://boxethai38.comupload/file/15667426283.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/bexikevika.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/31515041437.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/25127402988.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/76503844076.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831156df188---61178070787.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/gowulikexufun.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/54320159764.pdfIn PDF document text
    • https://ms01bet.com/contents//files/kobuvatajemujow.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/wefexi.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/28204765619.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/30920750887.pdfIn PDF document text
    • 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_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10252 bytes
SHA-256: 32bd8a02e5a9f9c8cfb1451a7b12b6b6b546bd64b648b339cda5209df64f2427
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 17504 bytes
SHA-256: 7b0e45bd206b5174fafec3270af3b4390ec3f62716bc9905493a756e254a6d56
font_02_sfnt_off00014103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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