Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ef4a5939664a65…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 13:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53585cf3ed323f445b438af1d0a0f7c9 SHA-1: ffb0b5b252a0430fa279ddfbf044659a04b9a15c SHA-256: c9ef4a5939664a65e8815d0f8fbd9a530d5132fcf21fe71c1693722414eb87b0
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, suggesting it functions as a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://csc021.com/userfiles/file/20210916104518_yndupe.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4910311061445295083f0.pdfIn PDF document text
    • http://thevalleytrader.com/files/dijajazasitu.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/51388867285.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/rejed.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/91028570595.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/rovijurebikuxokewef.pdfIn PDF document text
    • http://alvitraders.com/files/jebuwepunisesote.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/8217199517.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/39792573937.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210916_005715.pdfIn PDF document text
    • https://preciseenergygroup.com/media/fofege.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/95416772865.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/toxavuwob.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/90700046745.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/tawodepodoroxutotejalijis.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/12560466154.pdfIn PDF document text
    • https://stormester.no/files/file/kafitufob.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422bf673a55---56328017323.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ef6bd31a78310a2456d1f8c2db09c569/vawiroxexufikogaveke.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f72cb479e1---17572701365.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/peparesi.pdfIn PDF document text
    • http://fnathservices.com/upload/file/pupowu.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/wifejubumapabesutid.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/78205770145.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210916225854413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wonder+woman+2+tamil+dubbed+movie+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_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 10748 bytes
SHA-256: 17e9e775a27cd56f03fab627c2e67ce2674262cb56cd4f74558f18b55cd46c22
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16884 bytes
SHA-256: 7a6262b66be9f88e93502d9e72e0cb5e5f5144606bda9bf30ce9e6087c580103

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