Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2626951335b7358…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 14:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c40f827cf13c05309c3c23c16f516e6 SHA-1: 82062432391aaa37713003a5a7dd6d7f0d30170b SHA-256: c2626951335b735872c6f3bc7825e941e391f6a7a2f473907f89f42063301ff0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of embedded JavaScript, flagged by heuristics, further suggests malicious intent, likely to execute further stages of an attack. ClamAV detection and ML classification strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.area-tlc.com/public/ckfinder/userfiles/files/jugeg.pdf In PDF document text
    • http://honghuibio.com/d/files/47208264329.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/29586533715.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/45825242901.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/mixuxijudavadi.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/rerinabotabikodasajepo.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/sisilezuvonugogudufagasow.pdfIn PDF document text
    • https://novsport.com/content/File/gilosizukikapizobatisutu.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/52207188297.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/sikerumuxame.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/60337375722.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/28711446364.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/42108215201.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d032ecb05f---vuxijafonejogukijasame.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/pugokurapavatatonewu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421252e8ca6---53535400105.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109071532173166.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6b5ee469---puzolofitufemi.pdfIn PDF document text
    • http://baove24h.org/upload/files/bekafu.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/88231571495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tamil+mobile+movies+download+2021PDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/5857446416.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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 17132 bytes
SHA-256: 20959d03c24e2e39cac9a10588899de46a740d09518e1f9d70962ebc41d14443
font_02_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 10760 bytes
SHA-256: fdf482a5154e60b51dccc57fb70966f64d288b0214ee9bec6b2dab034c11ba6e