Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f019c8eb7f558d7…

MALICIOUS

PDF

91.4 KB Created: 2021-07-22 07:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4c85aa7d23ad4da438b1ffcd5a52183 SHA-1: 7ca607836e404150f09adb46861796b622f88ba9 SHA-256: 0f019c8eb7f558d739cdd77e304aedcd2414109a0af7cf5070cfcbef836871fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946eff13279---12429963980.pdf In PDF document text
    • http://quangphong.vn/uploads/image/files/11586071023.pdfIn PDF document text
    • https://synersys.fr/contenu/file/37069416314.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/muzigig.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5e0103237bd7a3bcf3c6abb8ccc0c6b2/60232780472.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7fo51j3okkiv3c9ldtjhanamr7/bubidorupibosagof.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rob05p4s9vre8r86q55af3rnn7/zusaga.pdfIn PDF document text
    • https://samowar.me/upload/file/rakawutekubu.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/45171083230.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/bijexofubomaxa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/50999823201.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/72520325848.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/h0j25sr51k5bvcho2l9pi55rrq/temuligadusozavi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/guxirubafezunupudufekij.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a4b214d7---42693741597.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/leishkri3nsonr131mcpuq5qdp/nanomebano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=quota+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000141a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x141A0 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000c81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 4052 bytes
SHA-256: a43720f1170a9cfc526224ad798395aa01666e4710352a638806b2de3b01b3f4
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 23652 bytes
SHA-256: 14f4e840051ef963b340bb7eeaf73813ac43a9b745f21bef4e317da0e0d8061d
font_03_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 10340 bytes
SHA-256: f6aa9c7f2e58e30ee19314d76ff8d1bb40544b3ee12c3c980f950b6bdf2fabdd