Malicious PDF — malware analysis report

Static analysis result for SHA-256 3652d50be681b98c…

MALICIOUS

PDF

83.1 KB Created: 2021-10-08 16:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d962544cc70b3027f25b258894afa92 SHA-1: a3d76bab5c01fba344419ca0d30196d7bbab7741 SHA-256: 3652d50be681b98c935d79a58cb664f76ba6e7dce1831a123d4b6851f27ec8f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest 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 lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=what+happens+when+you+airdrop+something PDF link annotation
    • http://yilip.net/userData/board/file/26879402169.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/87530093426.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/67521887726.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/pigabafibo.pdfIn PDF document text
    • http://losangeles.songhakbbq.com/uploads/files/83964685534.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/falotitenigizejikorixu.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/79661991414.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/kopuvetosa.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/29131944427.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad4045fafc---rabazokotaxafipupa.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/sefuzejafewode.pdfIn PDF document text
    • http://watch62.ru/files/files/36205348254.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/nokiwi.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/88679117008.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/nezetofujimibeseradakat.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/8047682324.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/85175091086.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615e6410a67eb---87967422660.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6542f5d9---zusakaxugakitexuvububib.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/xifitefotadux.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/23705598680.pdfIn PDF document text
    • http://pactolous.hu/upload/file/65616077875.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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 11084 bytes
SHA-256: 1cecc2d808e68cb9f072c8d799d84568b5de66524920793879f839305718fb04
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 18740 bytes
SHA-256: d9e70aa4e078fcc57161b41c2dde7e3aee726d6bcc0e6eccbb6aaf4701add34b
font_02_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1