Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d99cfed59e6d5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 14:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d09c62fefef6088fc6f8363d78124b8f SHA-1: e2c0e0036792e28a16d59dc786169d56c4d6db2b SHA-256: 310d99cfed59e6d5ccfd9c613b8309dc13d1c84f2ac169d817f5512e1ba2521e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=paw+patrol+cinema PDF link annotation
    • http://stroykap.com/application/views/stroykap/userfiles/file/sowobosarabaxexuw.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/25227518502.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/40926162450.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zazotabamukonaxesage.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/tenazovuxonituwito.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/64493569685.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/gigowatakirudelasedano.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/pisoxosoxip.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/67534171375.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/50218538022.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/377c32865552d61d68a2b1f529e49f36/powunovejekimubededekaviw.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/38544288682.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/30848208032.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161519d2fcc529---tozoz.pdfIn PDF document text
    • https://fond.ru/userfiles/file/jukew.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/20623758853.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/7197718897.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161536357895a2---57505153548.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/61275626398.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/48842383960.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/93035932662.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kekomun.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/12160728151.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192313165407.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/44043482484.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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 10452 bytes
SHA-256: dbc95fd5f6ad49d22f2519f6f27af406f859ae8a0ed3110d3bd0fd180a0ac297
font_01_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 14364 bytes
SHA-256: 52d25724c2ee191dc17ab1be3ac4d192bc293b437b1d250a79e7550e87053623
font_02_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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