Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd05d0e37d84361…

MALICIOUS

PDF

69.2 KB Created: 2021-09-03 07:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b3541dcd2773b9a74cae0bb302347a97 SHA-1: 811499e0dfe48b572429a5ef770f42cb63ab332f SHA-256: 4fd05d0e37d84361b63467e73a3623bd60b3af951118d5d7aa21d9e30896fd62
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bevillelecomte.ovh/ckfinder/userfiles/files/namudakoweku.pdf In PDF document text
    • https://b2b-intelligence.it/uploads/file/65460845024.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/78c2eec468d1c3e901e7ba79c993a1a5/42595541845.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/edfc95e7e2e81173f6c6be5685f201a5/zagezinepakakufi.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/42204811300.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521acd28e8---64008516709.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/mugitenarupaf.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/41468732861.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/viwelafijusaduj.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/39bf5be26c211d05cf8c8e106b1747de/40996725840.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/rumoro.pdfIn PDF document text
    • http://asfalon.com/__files/file/fizojirawetawerubinij.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/40c9663af6506ea481637e4e7f845a66/pejikidatid.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160779d70c4dae---tufuvelopo.pdfIn PDF document text
    • https://digireg.nu/upload/79784012417.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/96537369269.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/sud9up31nrqh3g9n3u114a9lj3/57112584474.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b3c00a11---39811707253.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/kubax.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d8ae5r53q2a66uttri4uh2gt73/28656147244.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/30996866884.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/66a768993c0de1580d3eca526e527368/26896483323.pdfIn PDF document text
    • https://loctra.net/userfiles/file/tegosabatime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=descargar+diccionario+de+ingles+larousse+pdfPDF 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_off0000b17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17A 14084 bytes
SHA-256: be725efb026c050d2a93c148f2934cca5e4dbe99c04481811791495d5570a293
font_01_sfnt_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 10796 bytes
SHA-256: a64c032417fbc3bed1d571a5daa1fbad2631138e1160d62064809033d24583a6
font_02_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1