Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9aca0d6b152956…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76a78587688f796259a064c647d767c5 SHA-1: 34545c6bb054412e04a56d644e5c607d4776fbf0 SHA-256: 9a9aca0d6b152956aa9622d73668d4228aec198c02e3db8c39632c0c887ad721
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for malicious code execution, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://laarakkers.com/ckfinder/userfiles/files/14520867697.pdf In PDF document text
    • https://dadrarad.ro/userfiles/file/180103831.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202195951202478.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2e921eb0b2f8a9d644708071852178c6/27245396110.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/22926397257.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/430543236.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/91064604058.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lewetobawaboxibitamo.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/ditidivasabad.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/nunezi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dabed17c5---jukiwunotuji.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/roxajixakinexav.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/78399583282.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/xijixis.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/vonavudaveromumujadofaf.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/070736491136.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/93942224937.pdfIn PDF document text
    • http://vejwun.cz/images/4515331149.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed2db981---futuzo.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/37904686371.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/25933293413.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/kivitetos.pdfIn PDF document text
    • http://schturman.ru/files/files/28989568422.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gbpsu5vpqesjepdj5dhjtf93k5/jobonewulaxegase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=speakout+elementary+teacher%27s+book+pdf+free+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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 11432 bytes
SHA-256: b9d9c7105def33d48cbb78e8c343fbc5644e4b00b9a0b7082bc4529be9c79525
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 22036 bytes
SHA-256: a166ccb49390e203552bb2d6d3361f44bbf3f15997796d4ac3c8030802122291
font_02_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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