Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb282dde154d0aa2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 13:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8d6320cc0c4755de5c8c982e3afb359 SHA-1: 607521fd12d87a5874a617cae4846719d2400ce3 SHA-256: cb282dde154d0aa2edacfb698c53d9ef8ac07c07e320545fb6d8e74c1f4cb9c7
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ffarchitettura.it/userfiles/files/jaweleruze.pdf In PDF document text
    • https://mimpisiluman.com/contents/files/juxurazepowavu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/nuwetixakawoxevimipes.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/53845323852.pdfIn PDF document text
    • http://okvin.org/userfiles/file/lipofumijamixojajalum.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210909165503.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbc796a2e---45135305934.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lpra5mtil4vco3st7vb3cobt73/11135808195.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/zuvekenironudona.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d2e13d40---gonemuza.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210913013748.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/vofubulatokibumel.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/pobuxolef.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/94875889740.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/nalibarozede.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109160831229879.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47235091067.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/85143807913.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/12892538097.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/58143687816.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/lidevexe.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/devokaxalopumekerako.pdfIn PDF document text
    • https://theurbanthinktank.com/files/bujenaketemaxin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=metal+gear+solid+codec+sound+mp3+downloadPDF 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_off0000bc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 16680 bytes
SHA-256: f62cbe7ff6a67923415360e7f206bd7373c1f587028c35b352f6b597a3ca7b7a
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 11208 bytes
SHA-256: 6d6537fae3ff3035d0cb53e74c1daf53c61f787c468754d4c431dea2323e0fc9
font_02_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1