Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5eb8eb028c5a25…

MALICIOUS

PDF

73.6 KB Created: 2021-06-07 07:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d004924ea53f52c257ae141e84fbb8e9 SHA-1: 3061587c12f0175ab76f08fe48dcd908edad5486 SHA-256: 1a5eb8eb028c5a2599fefd1b667f99b69ca61cd5c2201b3c7e5d5899e674d3b1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to facilitate malicious redirects, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=how+to+download+pokemon+sword+expansion+pass PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9630c85b63---40790705365.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160743b99ac372---tevofo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/5341238968.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc60cd3ce---38584069474.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf215002b---zisivuvafo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f29ce982ec9add1e54f9117d31f6061f/83603003379.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4891fbbf2b---saros.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/73f7d40ec24242d60c09539ca27495e5/75014714531.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/83de4b0599990ad28721b33bd8e8961e/panaguripevudur.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/69340030473.pdfIn PDF document text
    • https://tepihtrava.rs//files/durajujatopoxojijefe.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0da2bbjv3hnrgvvflavceleelh/43032455338.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/43857275632.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/402a377d4a4568b6bd3c52481df3ee64/kowotiveragoxeso.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/48400047704.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/500ab9c679ecf7a11f3f20fb4c701c65/59855083321.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a917fa32---44208340034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 5080 bytes
SHA-256: 3fe250f76f108431e20e6637fc4e163a45a226cc8f06f417cc785f5f415d3e50
font_01_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10460 bytes
SHA-256: 2689aa527d17f6163fb90877f311b52d05a4a21cb82e30bc9bcd3200e0c0a3c7
font_02_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2