Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7405d625f8fd5a…

MALICIOUS

PDF

74.1 KB Created: 2021-05-24 19:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e913004b8e3519f730dd1946dc622501 SHA-1: 0c9ef5f94da570f8ad147bd97eac4766ec1a0e38 SHA-256: 5a7405d625f8fd5ad05e3849e8768622e5968bfd5b68e7c902e17b31a1467ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. The document body, though heavily garbled, suggests a lure for downloading free software, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dd53b75ea92f8922024a15d83a60885d/2685990322.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e83a0f91---javafuxupikinoxafi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac53d8eae8---73611983271.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0e69d423ae2c019bf5d3d52119b7150/wozexide.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b5ed34ca---xifewukokaxuniz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db8192804---junam.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160868d2097423---xofoxomudebemaj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea72ae5b39---katukododiludazogofijet.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec65e52a40---xesepuzamoxitewosuwab.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/vksavjlkp6nl9tncik79tb3838/jopolanurolu.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/76125873001.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160743ec6bcc54---99541220641.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ffca307d---42788214164.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74431f334---zebuxawuvugufil.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/f3004af8f4e63c27477fd1fbae53b15b/86879456449.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/34749821391.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cf14873d---gavixerajap.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b6041dc642bd0138889aa3db39347771/nobuwuwaz.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772d26b3f60---bavutik.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
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=descargar+acoustica+mixcraft+5+gratis+espa%25C3%25B1olPDF link annotation
    • 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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 5516 bytes
SHA-256: 855299fe2f2171ec645dfb33d45e61c44fcbc2fcad0ee109fdf92db4bfc52a51
font_01_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 11092 bytes
SHA-256: d48e86cdcaf16d4e9faa914c3e82b63a902a76a16d64dc58f64a9a8d7a546eee
font_02_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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