Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38f8b479a4e1666…

MALICIOUS

PDF

93.7 KB Created: 2021-09-01 22:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24b75712be5f305e7360572d71c6aed8 SHA-1: 6e162afdac644007038ce16891ca9ec6d89136d0 SHA-256: e38f8b479a4e16667ddaea37a61d9b91f35846b058681ebf0a2cf47a28d6427f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or to download additional malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a635cc68ab---xemefivisazukijejeji.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/270a975a19c030ff879d01a64a40168e/voromipoxuviwiwurinez.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d3199a7b2485b1474360a82b5f00f329/59375393265.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4451c41b1fb980f1a944967890f21dcf/97453826329.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e9nkeecrbo3tda1nsao6rfgvd7/7698342925.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e2f941ad0---37958125964.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/6ad14de88821bbcdf3066068a32e468f/jorivavukuri.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210520115038.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d4bdf1b87825dee7862f8794c01d1534/30956361608.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/futof.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f2670ef94---41869522666.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rutakotezokug.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/tejikajufavolugu.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/xilavexezolal.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac0bbe388---xodidozozenotopaxidogup.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e0f50c756c054e27eccf7661a750a999/45165562031.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/54889548510.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/90491945913.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4645f7cc19---52148483084.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/45281182776.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f958c9be722---57739663516.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85848893486.pdfIn PDF document text
    • http://ned.ru/uploads/files/feriwekafabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nfl+players+union+contractPDF 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://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_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10664 bytes
SHA-256: 896208d00d213cfe5284d564eae7b864464eb233592705de5f707235062f64b7
font_01_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 17848 bytes
SHA-256: 1b3560097a177885e510d60ae12e8043a58dad63fb96b0d330280536b51e9420

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