Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba75542f77ef10c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 07:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c75ec1b6933e095523f02d3d9cf4fc16 SHA-1: 84253756fdf8a714332f2b8c5fc23b45b9f181bc SHA-256: 5ba75542f77ef10cd96decb7c0fac60c09ad4ecaecbea51710f14d89d63f43a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself suggests it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thienlongadv.com/upload/files/fupakaxigo.pdf In PDF document text
    • https://receptabc.hu/images_banner/files/41241087845.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/22467361583.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/liwagodanemagalet.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614138950793e---sarev.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109120127236740.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/83303444027.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161426d694749d---zivipuzitinujolozez.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131771234f68---87232662141.pdfIn PDF document text
    • https://renewone.de/files/fasedugonubipaxewami.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/70577597128.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8726999ba---wefimepezunirelunizum.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/bakudijowosal.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zopidu.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/69276275684.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/80277001562.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/xozis.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/40986970604.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/xidivaraj.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/26899284964.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jedewisumuwuvukonogejar.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16142565818980---60631253034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gloud+apk+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_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 17960 bytes
SHA-256: 31b78bc5ec8138a89557065f882d5c13853573b0968adc850068e577acab8db4
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10112 bytes
SHA-256: 086722808fa1d126a6648d2c260d905611801a2558999791de69cbdc08e95c6c