Malicious PDF — malware analysis report

Static analysis result for SHA-256 7709c1fc709a9949…

MALICIOUS

PDF

85.8 KB Created: 2021-07-18 20:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94961f40f9cbc8e60c18c10b8071f0f0 SHA-1: 809db61ec608ed6fc2911f8faa388e7277b5d31d SHA-256: 7709c1fc709a99499d6afb4f23cff89b80fea08024e7711e15b918910031afa2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. This structure suggests a link farm designed to lead users to malicious content, likely phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b118ba2f---porenobetosoneku.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af60b71803b---mesagilutib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bffdecad40e48babf3274826a64d76a6/44307980587.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4uv1qan1gchhuv5jkm708neobg/93380612361.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d3eff83de6a66dc146b0c2c882667d23/24395596735.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/27094347406.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f4cfa49415fe933be23a1e9ba4329414/vobawukomogipawiwoxegan.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/39551645115.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df07d119696---97579992125.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098384a3cb05---geratogewugejikovewif.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/455c9552830e554e0b495515a0b4c3fb/87825186448.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/91757398907.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/vuximorifanabokogemutol.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/85910107302.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sawitajenowawab.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/berotisozelev.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160742293c833e---47232821529.pdfIn PDF document text
    • http://rc-modeller.se/images/file///86013313892.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/62058081340.pdfIn PDF document text
    • https://mojer.bg/files/11221905443.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2a3a8b7703e72fb3d9223ae0fec54287/40855305289.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/aqflitd1up36kf1vlcbfbg5sfn/sikamedetoturarewozimikig.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/nubekigur.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd22c27ff2---baxijom.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nujavivopikutoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+put+books+in+bookshelves+minecraftPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4a9d44e4027873758a31fdcae6ec2d61/xabunoxon.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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 11220 bytes
SHA-256: b3b4a4e850ff48c7b2c382323faf6692ad827a1197c8a097499dd7b5fc14f01b
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 17832 bytes
SHA-256: ce4e4393b23dcc86d25f7a1f9bca1601f53a50bf98674e74a1a99dc7987d2963