Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0b38a25c5c4dd7…

MALICIOUS

PDF

94.4 KB Created: 2021-06-14 21:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2ba1136ff6f4b5bebfca338d04d565a3 SHA-1: d7ab6330772af82ddcea6296045fe7904b6e1f37 SHA-256: 8e0b38a25c5c4dd7f78b30cf741a1b05078451f51f684a17aa899dccaa557d81
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting PDF files. The document's content and structure suggest it is part of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://drafthe.ru/uplcv?utm_term=alice+in+wonderland+book+pdf+download PDF link annotation
    • https://babamore.com/upload/ckfinder_temp/files/20210611235612.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/senasixiwima.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/6679943706.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609986b3bdf6e---84178562294.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5d299987---lofutaxadufoz.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0609c27f---85237005741.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e2420ef3---52007860122.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d865736119a7c6293e261df5adda5139/fumanixedigudus.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/684e0908b420830825a8c0a733318879/bezoj.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/a3felssjuq0q6mt1ai89uc4v2q/gudar.pdfIn PDF document text
    • http://getem.pl/files/file/lusag.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4594e1a3---vuvanumipurerilozixixu.pdfIn PDF document text
    • http://short-story.ru/upload/file/vefod.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9e1993d9---10593951787.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4257d41239f1e3e68dc5eb8402f0035b/senavujulatazurenorov.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3d27c01cad4afbf029f09e9b6fd265eb/rapomedov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5256 bytes
SHA-256: dacd2be21d851bc81a64ff3c2b1a8b815216c44c2ce207d45a5814f83d5c47ce
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 4436 bytes
SHA-256: 9ca19e2ec29bb3fe1274299a13ff8c16c0968850645f8ee701e94fec15cf22a0
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 16780 bytes
SHA-256: 7674ac550498183d84a7bc213c0b5fcf0bee6c95278b03d3c472803211d488bd
font_03_sfnt_off00014bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDB 17320 bytes
SHA-256: e42a488e5b618577d3b68b5adf8541b8c2936c35290fbdcabf6b3586d16006ca
font_04_sfnt_off00016434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16434 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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