Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3478443cdc16ec7…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 14:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e948612a37ac8ec690be83776518e6ac SHA-1: 86c12d1ba98849b1b2da226fd6f93e897d3a7c72 SHA-256: d3478443cdc16ec787d8e17bedeb375f360eb2581ac37789e65164c51782bf49
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://ahdongjiu.com/upload_fck/file/2021-8-20/20210820073807459530.pdf In PDF document text
    • http://dichvutot99.com/webroot/img/files/67302399709.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/48809084137.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/73302730743.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136b43bd17e9---fogitunojonalajinerutamad.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/d536mrgfbd3ibp37ie6aruap3i/11309874094.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/43381a228dd79f84714fdd6e079ac8dc/malumasonuzevamixalorilar.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tudosonu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/pakawobelumozokuxusi.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/58606162709.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/29676217690.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611875e9d5b77---72460833980.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/korij.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d82b7986---7787401247.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/61804322712.pdfIn PDF document text
    • http://wwsm-us.com/files/file/rerajikonadimanidibug.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4946cae21644d6a4d1580439d2f2672d/kufonev.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/dagedexeweludibivufepipif.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d92b3b95---siwuzonudematugene.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/bebigin.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/tuwezifitom.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/21895712646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=interest+rate+risk+management+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 19852 bytes
SHA-256: 1c1121bc96e6ad61f36f63c3922bf1c6e2a8ba1877846d65f3c929608d7cd6e9
font_01_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 10720 bytes
SHA-256: 14db406f0772247b70c0985086e53fb11421a4d0a48be1eb9aa04934208761cd

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