Malicious PDF — malware analysis report

Static analysis result for SHA-256 66481331d0df84ab…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 17:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c3ba40dc6a69f718e677f2a4ece06ef SHA-1: a4dde052d9ea19d0dbff53169030d7718d9450b3 SHA-256: 66481331d0df84ab18ca4836775b2f42869a0d11a752593c4f54a5cf2551cf28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a multi-stage attack, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chinasoftcore.com/userfiles/file///43634149993.pdf In PDF document text
    • http://citra.cl/userfiles/file/kalubokabibi.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/26494436022.pdfPDF link annotation
    • http://rolmech-strzelno.pl/Upload/file/45188369391.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd33afe4872---sosozofetafumip.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/36933035255.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/90cc8ceeaa79b25ceb07d545093dae78/2337511249.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083d52bd891a---21124816089.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fb59fe8bf5b2292a2acfa7abf91129c9/nilelibikubomikenasapi.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/jodotuxe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de80e7c152d---saxawonapunovedel.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/perawirurop.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16230634486.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/57368919711.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/pulozoxitiki.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/wobumisibe.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1kkqvdvgup082b5sopu8ib1fe4/32654649267.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/92399134724.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/fefejanibokikupadosaris.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/weruridodiritimav.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/lulawaginumutasejulal.pdfIn PDF document text
    • http://www.emailposte.com/pictures/74320950403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=t+rex+and+the+crater+of+doom+pdfPDF 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_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 17220 bytes
SHA-256: 89c42ecc2cedc9da09c0d4347aa65e90b90c9ef1980cd799a2c200182b16a122
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 10644 bytes
SHA-256: 1202f686342b7ff9af9315b0267de65e0a3077de82c629410ecccbffe47a6389

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