Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e250a08f56a2e24…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 04:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec7931ed4f7bb52f6b0bc1dc07b701d8 SHA-1: 0607069ba0ce5d6e8cd742b3e60e6d08192580ca SHA-256: 4e250a08f56a2e2462a696f41e63d069c840b4f973c007b0ac1d97c8a020a444
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate malicious actions like redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://esebtekstil.com/resimler/files/80600424071.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4099fc0cc6---9532050820.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/zakuzip.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075de5531485---26270487641.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hp5sbqqu83m5sqv7up8uevaoa0/90102140741.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d35ef36b90d8beedd31adea7b30d3f48/24615389200.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dupuba.pdfIn PDF document text
    • http://paliukenas.lt/i/File/buvumapikop.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kuwaf.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/bawuwuwologuvenawosekus.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/50168def6b19e963d8bb6ac9f4cfcf59/mutegiton.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/xikuvoj.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/sonewe.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/33527728822.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkd29gt8msh205s0kht8bicgh5/bejiboboraw.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/br5hjomihgh4qd404m2sr3d54q/69531654502.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094016d6625e---nobopewotazovirumawurok.pdfIn PDF document text
    • http://iwishop.hu/file/vuvunebufibevat.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xojaluvofasagejejelewat.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/fojubu.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/zozivitekinomapibuzikipu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9c7e8e19---88792376027.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/gikoxakidamenaxuwubopopod.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/43940374208.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/98726457066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sketchup+shortcuts+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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 18572 bytes
SHA-256: 23680809c370c8bb8e2651ded87fa3d0115cb5ec0c87d2b6aea25c4703caa4d3
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10580 bytes
SHA-256: fa744ddc731f5e62fa9f16e8f5e937ef42c6eaa3c3bd3f7b690ad9a8adf4f9ea