Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0ee86559d9df31…

MALICIOUS

PDF

69.8 KB Created: 2021-09-20 03:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f89d89a19667ebf3dc472fb77c728630 SHA-1: 2588440a17d908801865f45c1c8ac2f9d1fc580f SHA-256: ab0ee86559d9df318c6d94d5e2ae57637826290d934d587946c256d0e529ba18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and other disposable hosting. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=among+us+hack+ios+14', suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=among+us+hack+ios+14 PDF link annotation
    • https://iveducentar.com/uploads/assets/file/nebuxafe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a544658194197020756dcb148704323d/16337935144.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lamowekowebemifowajeb.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xuvametoj.pdfIn PDF document text
    • http://zubrcup.by/files/files/90928867138.pdfIn PDF document text
    • http://ahchala.com/img/file/kukukapozojotowiv.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wifobujuwomerazevomuruf.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/74629362852.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/bajinasigiwirepuju.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/74678545461.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/24090628194.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7p3dlqg52mk08ikrg2dr9m3iqt/masexebefaziraluzisozafo.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/gipunozalir.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/72748240701.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7f9b8496c8dcdecd5ba2b5f273cb222f/winibonavipox.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/66925133382.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354d40a3232---puzibafikawukusifex.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/dedinilesavufofurixaxiv.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/39907649361.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/wetoperuwano.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904033311.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/49vj3bvnvhiivap26kgjij8273/dugupezogininokuvir.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_off0000af8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 16696 bytes
SHA-256: 51da94f6da08e4523071ad9f0126774a01069684a0bc2644420af769fc4f3c69
font_02_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 10604 bytes
SHA-256: 492d004793425daad2c73305a98e537c7718dfb57d561b6a9de24664d69b6bc1

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