Malicious PDF — malware analysis report

Static analysis result for SHA-256 7889a882745ac138…

MALICIOUS

PDF

93.6 KB Created: 2021-08-06 20:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74c5d3270a46a0339379e95292542473 SHA-1: d6a5f8ddd1e907c69a235a9d545deab6831ef436 SHA-256: 7889a882745ac13885598594b94f5a1f81eb0bb374bf381b6aeb0d69d787970f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm with multiple URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of these links suggests the document is designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7252f991e4a0041712364b32d7b5a5df/11802358200.pdf In PDF document text
    • http://royalgoodviewresort.com/Uploads/file/200173782.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/53469428726.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/4699233891.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zebap.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c58097da2d---43831052294.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/689a5b723ece3e4bf60136e62e566277/73907383496.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/zakirujasetoroxuwewosuto.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/88176055886.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/nujiwovone.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/kinuguxan.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74543547884.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f3173d98---39373274255.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/rumafujovepaxunademugerok.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f820892a---majixukeruguxirebifekiku.pdfIn PDF document text
    • http://teraval.cz/res/file/puzuvix.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/nixerid.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9b04290055d9d530e9bfb28165fda924/mivilovogosogud.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/82700125237.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/48905bdd94850bdf75ec830631a60cb9/81883641910.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608502b0ae100---51121244149.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/famisizolujapazabukipu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f7169ad14---xoxipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=libro+de+matem%C3%A1ticas+3er+grado+contestadoPDF 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_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 11116 bytes
SHA-256: 4d3f1deed0e59bb0a9f7adef9735e3ff73dc87fa3e8a5f141862887a18cda3d5
font_02_sfnt_off000137ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EC 18304 bytes
SHA-256: 69711a47dd8b38f107f119fd3264f12f80152ffca1d4695b695929f4067e3450