Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8bda25d4125a9f…

MALICIOUS

PDF

91.3 KB Created: 2021-06-09 18:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 97beb365a27a143ff7340d6406ff5edb SHA-1: f4150277c4769e624271e3b83e6ba8c1b0e6cb54 SHA-256: 8b8bda25d4125a9f03dfada80e0d507606de487f857702abe8fb94d746044cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections, along with the heuristic identifying a link farm with UTM parameters, strongly indicates malicious intent. The document body, though heavily obfuscated, contains text related to 'mp3 download free', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=luh+kel+wrong+mp3+download+free PDF link annotation
    • http://preserveproperties.com/userfiles/files/xarulonogituroza.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/sobux.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d1dd91ba---65670927339.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6657b8039---45145870537.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/fezasofe.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e2c5ab79---2719174625.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/16561355561.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/440ce6e7fd9c1ba2f2b227bcfecb3a7b/41940558570.pdfIn PDF document text
    • https://mmszke.hu/files/file/xazad.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acc03d77de0---22368637773.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8adbbe6d7---nefaneterifute.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/nemotoxivajuvulur.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file/%5C/20210506233049_534117701.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baf9e10e3---dugetunaso.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/nerilumuxademarolivudepek.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beff60e89a0---42435041881.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/70918905207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 5540 bytes
SHA-256: 6bc61721fb8d0fbdfc5c424b48d3be2b874848479f7e75f2591d4c242f30de30
font_02_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 6848 bytes
SHA-256: a9e11c97ebf3d353be54b122e404bc0eacc8222ed14ff9a66961b9eee999d88e
font_03_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 12652 bytes
SHA-256: b7d1af59938e327b7e727222b5207a7a30c721f719ebe37a975fbac7aa103be6
font_04_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 16236 bytes
SHA-256: 325005d4289fa306292fc1223cc052fd79e7cee8fecc3d0005d58845bca93755

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