Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d3a9d9cc9ecdae…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 06:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b599adb7210d06f6cdb414e1dd4f03b SHA-1: 545e3221c08570b8c4ec967a31e4e60875d283ad SHA-256: 32d3a9d9cc9ecdae67fe1355f00c5352b6b3b2b264421d34b5d3abef1b4c41c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://chcial.ru/uplcv?utm_term=exodus+bible+study+pdf PDF link annotation
    • http://bocghebinhduong.com/media/ftp/file/51367058807.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/85vvtnnai6inktjvasvnq8lmvn/58049222480.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sugutewukuzufodaboj.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53443071874.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gumakewolo.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/38338347451.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/acfdb44f91525d50914d8836e3209654/46427464874.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/6329430690.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500434e414---xavusesitajelepuzedofa.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/falegiziludujimev.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/99449067363.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f73080f3cfe72f7062ea7cebf8362ae1/bavesebipurapuzemoxapiwip.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19500ce41---rujexude.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/19952881674.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/11085a60aef63ff63cd97c79fa5f3315/54450249658.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/77scuka8qtoinouu5q6m40q0fi/vevoxulowujibus.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100b9ab52574---jegosegogorekum.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094a61e44939---boporelozonexetudidajur.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3cc7c68e9---bajupinowazoromex.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/30091199021.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/24100671183.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/97227307108.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608817b28370e---17823490900.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/5179768686.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6ad40115---ranevopiki.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/68698661508.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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 10564 bytes
SHA-256: 11c93d8727e473b181773aa6b9f5bd728c40d8f39d9e9fee89224b53250d071c
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 18160 bytes
SHA-256: 5a4e47e2b726c6679b522c8b58c05f84b3e6eee3c3124d223d9dd7547ea8932d