Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4c5e353aaae2a6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 15:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b5cc5f8f6f1edfd858726456a64b454 SHA-1: 8b2688e8fe715381daa9f93a19c9ed64735b2d8e SHA-256: 1a4c5e353aaae2a644a98e79aa69f3d9b3ec46485653303043809e1d8f88837e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=twilight+book+free+download PDF link annotation
    • http://westhollywood.ilovepokebar.com/uploads/files/vogalulafus.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/sezubupo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94520f34b---folasotuvune.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/73585475896.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/70082579676.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/75982831237.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/49772062524.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/69468611403.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404ea1d47d---nowususozeseluvofik.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/muluronenabe.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/lesisusumagaz.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/88825346972.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/badul.pdfIn PDF document text
    • http://chineseclothingonline.net/File/wifamogejexetizowok.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413997b94d6---67564280571.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/liwetibotide.pdfIn PDF document text
    • http://savemaxint.com/files/file/26566440397.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/47626958038.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/xobukanozimenevakazux.pdfIn PDF document text
    • http://soc-in.com/data/media/files/19549316002.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/95791241721.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/bipinelimev.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f9b8b74a0ce8a4bf92d069a1f60f1538/56146902707.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_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 10748 bytes
SHA-256: 32dd16dcc854451e2d6c1c00d5dbfceb6c23d96add8f47a3f81e413e7d0e4d1d
font_02_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 18208 bytes
SHA-256: d1b83f57c7f4ec4fd31ba571f4520100b12f39427cb97aa666fabb32d37f1dc1