Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4bf22f0abf7f6a…

MALICIOUS

PDF

91.3 KB Created: 2021-08-19 22:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 17b3577b55f6afb322c40c4f390cd6ef SHA-1: 2ee9d9e2ba485bee097fa1045abd6a5a9728609a SHA-256: ba4bf22f0abf7f6ab54ab1d6b1cff44645f333d177f603f525fc6b54c4289cf3
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc25bee6e---9053680537.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c37078b5b3b---60546028552.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29ff2afea---64360509236.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8091587145be8c24135bfad4151dd530/25488660045.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/denidasobitedal.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/mufipetasoluri.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/biroditadot.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/niterid.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/nefatavunevezevofivumafev.pdfIn PDF document text
    • https://breedlife.com/upload/files/radiburejidaxiwazetiro.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0dcfdaa9845bfd3fe0d41206dde2e287/tivimudarolona.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/77820843716.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9fd824728b1e8ebefc6d0812fdb7932e/puvirufakalerozesatar.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/48143549950.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0ee9dcdd4d3e98f03bf8e8f7f74637de/kusax.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/2306624532.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0b84ed5cb---39878621595.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/51652417909.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/24592818265.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102dc70cd7d2---25065580437.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/db3399c6a8c255bd066fd54ae4b1f0ab/nebidonotar.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+de+minimo+comun+multiplo+resueltos+para+primaria+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 18008 bytes
SHA-256: f089b805aed1c1a01dc916012fc3a538128baed085747964cde64905f83d0866
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 10992 bytes
SHA-256: a366ef94ee0ba1eaf571bca3fb3d1dcfdef28ec4a38a7bb992673e1502412262
font_03_sfnt_off0001443d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1