Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c8464411168444…

MALICIOUS

PDF

111.8 KB Created: 2021-09-21 02:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f69a98b2932a232c35638b28382b719 SHA-1: 73f5d701373a77f94560f6e086ae70b0df721604 SHA-256: 99c84644111684447370806b467c0a08b3e5821e00007acff4e1182aeddc4d8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The file's structure and link farm behavior align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.videocopilot.net/assets/public/ckfinder/userfiles/files/79707308373.pdf In PDF document text
    • https://maria-galland.ru/files/file/99969385285.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/79854478097.pdfIn PDF document text
    • http://canadanur.com/resimler/files/xinagubilovid.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/ladelajiguka.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/56055215744.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/81369600845.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc512b7a48---vulowa.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/46866596730.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/xakawok.pdfIn PDF document text
    • http://limoride.net/gallery/file/27103637944.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/losujosamabefumebej.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/24397045760.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/92565885637.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p4tb7nrgov8kgl8e860jmhqci7/tajimeramakog.pdfIn PDF document text
    • http://pedraferro.com/files/files/vekigovux.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c1cb003dc6ca8c3b124528e8a40d3194/75136189925.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/12859908267.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8481bc5b9b311909be97ff3e380b6a25/15337732062.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cc1a0f353d42e307111f0c00be1c932a/44844334158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=intended+curriculum+definitionPDF 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_off00014dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBA 10356 bytes
SHA-256: f253de4e2568eba369ef9321622148df1f3b486c1c3c94ad14c4464ef962316c
font_01_sfnt_off00016505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16505 20112 bytes
SHA-256: 602f946e1cf563d123cedef90b04b0a739e1a51c6f8afde10cf74bfa6a34fc47
font_02_sfnt_off00019973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1