Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e4e51037a52658…

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 19:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88ca30a44079c969cf97d5d8c8aa84f6 SHA-1: 554bf0fc2e2aa256d19a0cd0d8a96b0a2f48d248 SHA-256: 92e4e51037a5265803dc83ecbed24122a3335b110078c3dd15d22bc5089fd6f8
96 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' strongly suggest the document's purpose is to act as a link farm, likely for SEO manipulation or to redirect users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=which+is+the+best+ad+blocker+for+android PDF link annotation
    • http://sictombbi.fr/ckfinder/userfiles/files/11495425920.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vunepajofixebibeduda.pdfIn PDF document text
    • http://webursitet.org/Files/file/73464901945.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109191001432708.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/barofulawatogomojagoser.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27289882a---86050371795.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/15601988963.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b7431323---mosededijukujexuvikukona.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/tatamun.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/44052fef9299d4b579982e971194fc7b/sabawowifuveto.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mebilifuparorew.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/turevelibomurupakadunim.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/51763195378.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/sinumekotagagusedana.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/84649848950.pdfIn PDF document text
    • http://forti.in/userfiles/file/lemiribivukugoteriwumed.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/35780260151.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146d84e792b7---xetofi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/538cca24f25ad74c4e21b9d39369beff/gaperizedukoro.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/45225124776.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/78234477181.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/53361715361.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/lejodasanenifapaxazi.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/11110282308.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_off0000bb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 10800 bytes
SHA-256: 0b0bee2a506d7882fdfd6be4e25695193832b15c8ee27ec5b5d52331f3255260
font_02_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 16224 bytes
SHA-256: 12de29229563b67d57f463ba35364b0b214dd2a6e90c00f310b3d3bbc13fe6f0

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