Malicious PDF — malware analysis report

Static analysis result for SHA-256 48efd41d3bde6f44…

MALICIOUS

PDF

86.9 KB Created: 2021-06-11 22:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b03e530ee31a9364f29c3196adc811e0 SHA-1: 15ce447ffcc9dc7b2b55a3e4d6b2d454f247b8ec SHA-256: 48efd41d3bde6f4400799be9019817a8c8aaacd74e7eecb82a274cf78c6a7c19
156 Risk Score

Malware Insights

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

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 0.9995

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://irlanc.ru/uplcv?utm_term=how+to+make+slime+without+glue+or+cornstarch+recipe PDF link annotation
    • http://adaviestransportltd.com/userfiles/file/nubeja.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/94038426212.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be42400d3a---bataset.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/diveruguvisovuvogupag.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tilabinufolirufipogiwaki.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/pufilikogenenoguwabozuw.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zakomaw.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/o59ebm3cmgfoltnjpmpugn0db7/tiduvejulivewoguf.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tlg2o0qicm69l5591os2823qv3/galutinitururixawokiz.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/43371584118.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/42a3a933fad6834374731840d892189f/wulawuvavozanuti.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/012697dce4d6ea6c3da0d605144afa93/xadogo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/kizekopivoma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bea3c9c24---37302918961.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/mefipifokugop.pdfIn PDF document text
    • http://scro.ru/pic/file/77803005515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • 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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5348 bytes
SHA-256: 2f8017dc1f71aad5e1b8db09482fc604e0a1076e073df120f4d5659e258b8e7f
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 2424 bytes
SHA-256: 68503592a9b13d04c66d91ddf83a4f791ee3d30ad04418e07f32f6de173285b6
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10544 bytes
SHA-256: 6fd12ac5dcc89d118f833dfb3c4a9831fb02dd5f272ecde80832632c26dcd8c4
font_03_sfnt_off00012a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 16164 bytes
SHA-256: f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd
font_04_sfnt_off00013f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2