Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a8d2df87c78094…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 06:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: aa5d3b0c55f01cad12c339c17588f1f8 SHA-1: 25f2ee5e70a46db9f51e63dccc7978a51d1a632c SHA-256: 10a8d2df87c78094161853c68c34d515f594570aea2daa5314a72ab971f35603
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abwingsbuffalo.com/uploads/files/tobog.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390894e2f74---fapiwojomenisazepibexoxum.pdfIn PDF document text
    • http://vecsecity.info/editor_up/lotizi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/gowome.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/mikag.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/88850974518.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/45681154974.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/koreroviketol.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bibonadagoketajuzudotamo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6c502019def45a56e2e0da0caccb71ea/pazupi.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/repajizefipadutul.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/kesefofuvivu.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/deroril.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/rulafose.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bixanakotamuvali.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad8abc625---xazisasadofovami.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/77421897608.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/wewimaku.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/81226939463.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3hsmrm7gvgg87j1ee11fitim96/lemudu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376e86f37f1---13595037189.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/25235051451.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/8765495685.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/61055382285.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/19278142458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mp3+music+downloader+2020PDF 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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 18284 bytes
SHA-256: 90a9b9f505e12f0ae09808a40feb6d655b27f2dd69b07ea1bfb6e615297abe99
font_01_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 11172 bytes
SHA-256: 2bd1a8b43be2ac51bf6f557d8bfae44d994ad52eac24ac5b75031644be4ecd43