Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45ea3dfa259a1a9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 03:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e03b402e67ec1ad1dca8316575ac25fc SHA-1: bd4ca829e6582754c54a931a2cd0091cda664e3d SHA-256: d45ea3dfa259a1a967479bbe8b3654d9c37b8cf35837ac1d307d2c89413131a4
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 compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

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 https://huntic.ru/uplcv?utm_term=vedantu+class+11+physics+notes+pdf PDF link annotation
    • http://wmsone.com/eimages/file/somone.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/tipowaninolopuvimo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/eutvpqd8fhm8il74ah5qita63m/93189988865.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bilit.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/jafikokixibosufe.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/683d5004dccd2c1221c9a7e83b84b387/61192077724.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jkfllcpooc0bgarj8ekh7ija85/negazasebom.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/lunekexofawokepidesapu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161368f2d6da74---xedokuwudix.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1e5218f62486aaba2eddba3bb6e5dbf4/50070140495.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kpm3gaolsql3srvgv1depai3a9/18052697807.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/26265251562.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rplhpf9graqnpga914qg8hmnu7/92957678392.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af974c0b99d---51025135557.pdfIn PDF document text
    • http://lagrupacio.cat/file/bejosobawonozatowizeter.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/gisunapaxifuwonuji.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/zebiniselirefumimelepima.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073f35f258ac---kenijumubijotosi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9uk6f48aul98n3j29dkjuck0d2/xatipesijudipo.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/98503638707.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/68283883156.pdfIn PDF document text
    • http://aimic.com/userfiles/file/39338392893.pdfIn PDF document text
    • http://lg-palette.com/upload/files/19116593705.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76073813653.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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 10852 bytes
SHA-256: 6be202a0db2055d6b8fda70a0961ca19ed4d02a35069b0b2a55e7d75eb2b73f6
font_02_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 17984 bytes
SHA-256: 5362daa2f23cc7cc0ba95606714cd27c1cfa44c237144c90b65987ac8acc4ebb