Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae808ebb95d215a3…

MALICIOUS

PDF

99.0 KB Created: 2021-08-09 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b95218f596e39b91409efe9c4295607b SHA-1: 1078e3b2b81dc115ec02663b88ab5857a8f4adcf SHA-256: ae808ebb95d215a394e78c0f098090cd5f292ce73822ab1c5b79f61bd3a2027d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/84401675461.pdf In PDF document text
    • http://signauction.net/userfiles/file/46934326823.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/3022099067.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160991f5bbb60e---58198671946.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/84455503200.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/53260734266.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8151e630d---78165964330.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/56244542464.pdfIn PDF document text
    • http://budka39.ru/files/93933404753.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b490bd769aa92a496a9ee2892da116fc/34001790680.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/melevude.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/81418892927.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/tiroxomegofogirelevuvol.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/56400835199.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/punuratilajobo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0a743a6ff9ab1560002ffdfa3ebc347c/vofipuronerunonavutagi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070795b51e6f---furir.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/27a7a79dafb4b442619b71aef4cc1ef2/duximajogojezob.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073173becb4b---fuwuvufox.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/lirodv54eitrkpnti4t667b1ri/bogizisuwefifibawaz.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607251d03801d---57267596515.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b022c93b3d7---jagitikotixuvojunekula.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4dc49fcb23b3d4fde46e9ead36c710a8/jadepudigoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=definition+du+street+art+en+anglaisPDF 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_off00011cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 10632 bytes
SHA-256: ddef91d1ff5004e7b599a3f5128e40d3cf702e993ef436d4c88cf1cabfb81345
font_02_sfnt_off00014d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D03 19124 bytes
SHA-256: 7737e0558a54a9918d75289811088a386610ddff9831ab459d3398d1e706f105

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