Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41fda9f046dd4b6…

MALICIOUS

PDF

93.1 KB Created: 2021-09-19 21:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e9602c5cf9b680d9762d652735d200b SHA-1: 3abc42ec90c0dfad884aa91bca2f8e4795e2b338 SHA-256: d41fda9f046dd4b602cd31e9aefae961982064f8f71a04ee33410d506fb08287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=napoleon+dynamite+full+movie+gomovies PDF link annotation
    • https://korovin.org/site/img_ufiles/bumugejunabomefe.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/52509261425.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5fd15c19---51192214637.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/59748306786.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/12403491535.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/nolowuxibonaberir.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/mokepibuwutosos.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161406f213545d---17847907940.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wilikuzugevezonaxido.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/nusakutikusepavoxovox.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/78289412686.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/77488780530.pdfIn PDF document text
    • http://forti.in/userfiles/file/vikizinodelumeferuwawen.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/72163482278.pdfIn PDF document text
    • http://ud2-140.com/files/gizikilunizakimuvozu.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/pakuserepinik.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/9806384526.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wukopokapamusoretir.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/24693953395.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210914093047.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2e5228823d78a646a93f7f8856fe38b1/43796042617.pdfIn 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://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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 23632 bytes
SHA-256: f5b3a54d19dc87e868a4d194aa832a442d2a1b90d01e62c2f014268e3422200c
font_02_sfnt_off00014bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF8 10996 bytes
SHA-256: a4a770c12b04e063ed2007b90a049afa27d616b75fcc6048114b9cd43be9bd91