Malicious PDF — malware analysis report

Static analysis result for SHA-256 e653451b081af354…

MALICIOUS

PDF

79.1 KB Created: 2021-07-10 04:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4a55c47ed11de02f7092dd14ca1344a0 SHA-1: 7f1184ec3057b43a2a1144a58ed044797086241c SHA-256: e653451b081af35418af71fff1e73a69d2013bd6b76f83c5321d04b4a703da5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress installations or hosted on disposable infrastructure. The primary purpose seems to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://citytrafik.nu/images/file/49809784360.pdf In PDF document text
    • https://ksuskalology.com/images/file/43843386402.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/aaa300da0b8b73cfc97af2a95c6a7318/zujidokij.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/61372347771.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/rumulowavonazibivupalagis.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/rarowirenavominuvuwawe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/477f254fd5e547305c07f6a951482700/55015133723.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56bc9a0f3---51664630558.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8c0b0019---xotosufuto.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5195bc312---33152491304.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/82958546090.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d566b36534c1399b85724b9d119ed8a7/wuvirobubuvuzi.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/tovudemexeba.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210531045944.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607240a30b840---38013879822.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf9a7021a---gagum.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/2529176503.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072fdd54a0---lumifufekobobakajiwusawos.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/5b554ea51f3db293e85362035a7dd087/dipedoxisuvakerarisas.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/88693304816.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bugusubikudidizumijuw.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/jowatukajikiva.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/67485450287.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6783e70715d1ae989913001929d8b5c/tibafewubeziruvaku.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/jekeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=haunting+of+the+hill+house+2PDF 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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 16644 bytes
SHA-256: 6dda747782432dba3286cf00f64a2bc2cc27b687d53f93d40d975bc416a6b038
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 10604 bytes
SHA-256: f55684b2414b49f627af3d03d69e3bcb917642735884a606924fcf3ca02f5878
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1