Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a865074830eac3…

MALICIOUS

PDF

70.7 KB Created: 2021-06-24 06:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2d4898cb558747874a52599b70835fe2 SHA-1: 7101344a6c1a6b7a22098fbf686cfedd69ea2af5 SHA-256: e0a865074830eac312dbad6a1facf46ce1a9b3dfa64352e2f53cdfd5a16aad49
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9575

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://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/94de5dfc87d77f4c5b23297a20aea20f/28644506418.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce640a5c1---wuviralodibulipap.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/838821b4bea5ac3b5460d18ba53ea559/1198563877.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fc9c94107a9c705d9d932b14fa872213/96694126468.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/dejipijuviregupowakovum.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/93s7jvj8c7hcadmjio0tr8t16s/73279536737.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/laremido.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/winolikegulibojunobef.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1e391bb190bfb29bd60781caaf3b41d5/vebegowikarumomepuxe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/l67bt1qb85mk3ecuo1hi8djn81/85080800428.pdfIn PDF document text
    • http://mp-journal.com/media/file/46976572931.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/2104144096.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/49548419207.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=como+copiar+texto+de+pdf+a+wordPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 5156 bytes
SHA-256: ccb492ae3ccac088247573f7224f15dbf2960a53f94a9a669fe33eaa0e83d099
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 12140 bytes
SHA-256: cfca09294e029d3eb6b60eb913ec72a1340d54408076a7d99225219ffb6ab572

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