Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bc640031cc8a6e…

MALICIOUS

PDF

74.4 KB Created: 2021-10-02 10:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50003a3ac30a546b1f3ff57c0dd564c6 SHA-1: 5a528f8fcf637a765b060fe9481b2a5a2c069f62 SHA-256: 64bc640031cc8a6ebadeeb0bc452ce346be46551880ed97005ee1d9ff937ae76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9e72796d---pewizijoze.pdf In PDF document text
    • https://torgradio.ru/new/files/file/wabipofikegexadinemav.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tidoradu.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/73374535387.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155d5312f4bb---wetaludize.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/sukeza.pdfIn PDF document text
    • http://newworldss.com/uploads/file/bixitavoparusadosumosol.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/zewuvixiso.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140719c85c16---sedugerazakunijubawa.pdfIn PDF document text
    • http://kmsenior.org/file/files/rekovate.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d18527ba7288f8a5d3b2e8a63ad88340/govedegowidiliteravexupem.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/vulatipix.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151f6109b70d---67289029830.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/tunegixezakixesa.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/29546205291.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b5be76cfc4bf8b908e86b2579196fadf/bumazom.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/futilitek.pdfIn PDF document text
    • http://hzqzg.com/d/files/senarokajikuji.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/18960203146.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/fudubeboxafobisu.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/8740778993.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/guzafuzupuvuxewo.pdfIn PDF document text
    • https://turystycznapodkowa.pl/userfiles/file/11668322598.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/sifosobo.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gajidonolutapujokewugob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=unturned+vehicle+commandPDF 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_off0000ba86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA86 18944 bytes
SHA-256: 58ef67f80ac8e6e2faa2fa18dc426527e1484c8d801534e224369c2f3faf646a
font_01_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 10640 bytes
SHA-256: 80261a155201d5c405f084a924de3b9189ef57de87a9d8779ed4d0704d50a431