Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0892aa553595edf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 22:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 456283189bb3d5c144882997f858dd96 SHA-1: ac06b37f06b49af0f29e34c7180ea1400f95edf0 SHA-256: b0892aa553595edf9a303364071bcf7c43f5e5421773409b81dbe126f91d5f2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=face+types+and+hairstyles PDF link annotation
    • http://123dvere.sk/files/file/muputufetipalikubaforu.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/60781289874.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/43220556506.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/98350923875.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/35886679499.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/2897735800.pdfIn PDF document text
    • http://4bx.pl/public/file/6460557740.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/57253262761.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fb9a6deda---52875382064.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326d50c43d1---79082919758.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/panemigifota.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147248e7d7f0---33603702195.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/70912291372.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/wuxaza.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/pimekapiwexorizabafowon.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/60089594901.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e83685ccf---91494030973.pdfIn PDF document text
    • http://kisito.com/userfiles/file/47792111675.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a6b0a79c708f7630d001360d3d996177/zesakaxememogiworesul.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9c7be25cf924af3d720362dcf565b233/zoxebaguzetef.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/920d2774368cccd0283b32bb7a181d0f/sirugipux.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/tizisotizal.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/pavavuzef.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/posakokomibediwo.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/45646750929.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/87919283064.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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 17412 bytes
SHA-256: 92c9f1063cd42025510f957d526f789b065249364d19a6419fa482cdce9daabe
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 10584 bytes
SHA-256: 75976a420f3792e65b668dd90bd216b5ce890cf981a882d6b94ff9792476cac1

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