Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b16ed4aaf3e4820…

MALICIOUS

PDF

86.8 KB Created: 2021-07-18 12:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ad46ac5aa84a009cac437b57a6e7d18 SHA-1: b3e2c53ee10c2acaf06ba25f0ea9e1824a47bb88 SHA-256: 3b16ed4aaf3e48202e2f18d89653a3c5071849575a3b87864397edcfd06777ff
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristics suggest a link farm designed to redirect users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ancoraeducacion.com/images/romula.pdf In PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/tejike.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2b3ffcc3472d75dc2ba821b426d4e968/19700678012.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/8936846709.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/27555304553.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ee0e6b8bd915225343ccfd21df9abc0f/mazikovipomezolinoker.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b897cc7de---jugemilewe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1abbf06f9e1f163a51343bcc9d50975/56649016217.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b3b0ed9c---tirumotexebubodosax.pdfPDF link annotation
    • http://baraanduliaptti.org/userfiles/file/pevif.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/87e396f49e8cd89e99a5da8f1d82fcef/37808982264.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b6fabee085cf1656fa4c424853aa9fad/rovamajagexixamopafu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/lajazipixorebaru.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/xojutuluxet.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/winogines.pdfIn PDF document text
    • http://askort.pl/Upload/file/8638699586.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mv7t8vbva1u017uvut649tpkql/legada.pdfIn PDF document text
    • https://ikima.fr/uploads/file/lajeruraxolamexeketow.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/7279049457.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/khul083em49179a4sdsca1o5va/14135239578.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/a7pdtmtr4km2v9cjf5vku1oapl/dilofubukotagisezobidil.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wezomofiwe.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607acaed6dfe0---rikonifamem.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ace9c3f86f35329e095e958e92095524/50850578477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=x+2+piecewise+functionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea74a0fef---nunapulir.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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10476 bytes
SHA-256: b5cf647f6b6d55ac3dc19292829b503af6c78da4bb00c4670afe3d4b3772adec
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 17388 bytes
SHA-256: c5d57bc33668257ce5d6f851e9e2dc3b3d6441fdb3980d8d234f438878bd7c37