Malicious PDF — malware analysis report

Static analysis result for SHA-256 a713f4d8d28fb6a7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 18:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17b2b8d9923915a07ae4dcacdbeece18 SHA-1: 6af591ad69106611d6719846bb49743a2a784808 SHA-256: a713f4d8d28fb6a7b04bc15f8607ef8b3d5a3cce225a4680e570b267eeed5a37
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://infrive.ru/uplcv?utm_term=android+course+in+niit PDF link annotation
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133496e29d60---36403878091.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/70343398169.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/xesabekiluvenanibosag.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/relituwagexibekoxarokunop.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/97563508865.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b80502354244bce862026e54da78ca79/7025658777.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/xosizutow.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/kujepakitozemoman.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/xolikitamo.pdfIn PDF document text
    • http://goldmustang.com/files/files/tegijapito.pdfIn PDF document text
    • http://ijfbn.com/editor_up/rigezu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132404311d97---55482379775.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/pebup.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142595f8e61d---37380086192.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/tekexajovaku.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/koretekaduna.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kepesazifanibikene.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210924222826.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/bobajozufomofasaxivuwi.pdfIn PDF document text
    • https://kaparatt.com/images/File/40923957686.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d370f01e11---tikolefajivufiwopinewagu.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/zogakajobedatijodipo.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/50703511214.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210912080823.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/folifivakoruvukelidil.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/44511433148.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/56015473414.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_off0000b2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 16540 bytes
SHA-256: e524b04d4fda253e266bdc9e8c29737d42a2c55a8791e5160aaeb965c2f4c003
font_01_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10236 bytes
SHA-256: a39351bf2f813c0818a6f82ed74a16dd923d3521cde92d9e217ccc67f29ce5c7
font_02_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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