Malicious PDF — malware analysis report

Static analysis result for SHA-256 839f2476aa9c630d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 04:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5c458341a86e93db4a0bba9dacaa0f0 SHA-1: 78e817c4f08b018ef5706b5c6bb287384cd594ae SHA-256: 839f2476aa9c630db0d87a4bb8251d85e6ba1240caa1cb2aacbdf9080d821663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to compromised CMS upload directories or disposable hosting. This behavior is characteristic of phishing campaigns or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ansatrans.ru/admin/ckfinder/userfiles/files/26997502285.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e3fbc3dae23e08ca0494fb2b985b13b3/84932398014.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ff93ef97709ccdf485566b92b5afd2ba/23344258341.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cdd8993b---furifosoka.pdfIn PDF document text
    • http://bienbao.org/uploads/files/33256845384.pdfIn PDF document text
    • https://keongracun.org/contents//files/8533609707.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c59f3278db3b691c0f73eaafd82c6b84/bavolobipup.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/6715338713.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/sesulovu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073711ed53a8---81693221891.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5a890212---79760256168.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2715c3bb---xujeragarumajok.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/84450522773.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/jurimasuxejafakotatod.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/82515979063.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c57d3e2f---70043335254.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/xerusitamufido.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/zedutozoluxosisegoki.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5899440a0959cc0ccf7f91666da1150d/jukukugexigu.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/23602410085.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/7150788500.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efd515d865b---15992510337.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/woguxedisaj.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/sabebunofefesusuduteru.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/55437346829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=imperialismo+pagano+reghini+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 19132 bytes
SHA-256: fdf59eb4556fb4a3d390dd1db46ad2e15330ad7da9c56e69cead970039a57e6c
font_01_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 10796 bytes
SHA-256: 43bd58ff660d1a8630753db107920af5908f17a8a6a7303d056c2938abf5f265
font_02_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1