Malicious PDF — malware analysis report

Static analysis result for SHA-256 03db207c0e852fa3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 23:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0ce2f9d37b76017cdd4b80c65138000 SHA-1: d84fa960348d4d6645ba49a9060f16518e735e96 SHA-256: 03db207c0e852fa3f4aa5c178aa42b8750205e759b8d292b5e1fbe623fd605ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zap-interactive.com/uploads/files/8304193544.pdf In PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/59186067591.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kapivobojosusolar.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/pamawedagunet.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/sidegovutaxosubitux.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9d0bd7a1---94055518521.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/7458880467.pdfIn PDF document text
    • http://marymo.ru/uploads/files/21254244056.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/zixopuzuvifutuvug.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kanilup.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/dijofedoxavugivexizuviku.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/72909251447.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210908182015_673943271.pdfIn PDF document text
    • https://mkart.it/uploads/file/92901921021.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/tonugokivemosumevi.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/34914005314.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/24865283228.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b55d0ad62e092b7ec5b548e3e950d650/mujimuwarasib.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/witikopin.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136bce127e07---11430171910.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/42463463465.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/poridosejezonigekosa.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/disabov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=brooklyn+nine+nine+online+stream+freePDF 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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10636 bytes
SHA-256: 58b13042f3251c57a482817d5a58b1edc28d04060d9e80d8c78a352946debd9c
font_02_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 17440 bytes
SHA-256: 31ab3d332d57899112eea1c8894abbde4f0ee2afc920a2ea38a54578e291d29a