Malicious PDF — malware analysis report

Static analysis result for SHA-256 4701102437ac9bc5…

MALICIOUS

PDF

79.8 KB Created: 2021-07-04 13:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29d60ac46e86d66435e7770a661b4493 SHA-1: 84fc57869862dcd223503cd4934bb06f80fb6725 SHA-256: 4701102437ac9bc54020f8f47f3877bef8883fa9ef2c5f5e308ab9b026ef2f1f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i7v6kgullmpks7l3v5r9frm0k/zarogavoxaselawitokepawe.pdf In PDF document text
    • http://bafiti.com/sklep/userfiles/file/46352215189.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3189409fd2108fada552bcda9bcaa3b6/rigamutogupozumu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c572a51b8ea---zadotowobisiwa.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ab4b540da36f2919ab558308873bdb4e/gezajezi.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad6b61ff2---gipowivajiwawavi.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/lt1algv9sf2mg9s6fabv8d971d/terutuvolajejo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/39447666186.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/82364194984.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2b34f4c00119b754596522c06648b337/82091591051.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7813d46371---43898452721.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/vixalavovafudejupax.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e2ca491f---jexinaxagudiwesiwifomof.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/49b38235781baa4818b5f5fc5d644d21/sexaxawididekotub.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c157a927b7---48893430104.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/75641d6273f53ee5306593fc5b70ea08/80731469847.pdfIn PDF document text
    • https://cargotavio.ru/files/file/sesibodekuwiwoxobapowape.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/jemirasomopaxakavikaliz.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fbeed42f49a9dca1e98283eebec0942c/fawidofola.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160901063d2770---57725299886.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zusubuwaroves.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/88445097694.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c295eef8a6---xusuwuluwefidisasu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/woxukepuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kgf+chapter+1+isaiminiPDF 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_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 10804 bytes
SHA-256: 4273ecbe5ef9937d13e6ec3fdc5d5be5967eac0221e8eda7b564def42729e3a8
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 17668 bytes
SHA-256: 36aff44a98e317ea0cbbcc939f74d8012483896897579d799fbf7be6372b0c0f
font_02_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1