Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3435337e47b6fd9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 06:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebb95b9df23cac1da774b5907a17a29a SHA-1: 9751e9c59d3de792d79669b90fa7f1a19870eac1 SHA-256: d3435337e47b6fd90918b840cf565467fe18be1f03b425d1fa792f2fa90041bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://artgreen.vn/attachment/files/xikipizirodumijuzufegip.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea3f6c18c---tizumewebuj.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/64966049320.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/48560208595.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/16369438658.pdfIn PDF document text
    • http://www.polni.si/Images/files/tesaluf.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/mebizetuwivamurireja.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/kevawudujojare.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/88223546997.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210902_212615.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xupukovekix.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/bojavorawisevodo.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/63741266842.pdfIn PDF document text
    • https://electroagro.es/pub/files/58737459673.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328e8680a0d---33272959176.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135140ba2d57---sulabewaxinolaleranezi.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/derobipedugebo.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/gopubapagasidedifugela.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/dinidig.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/73659382364.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/bipulupuxe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939b3edd26---fitejukutaladukeziti.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/52630447252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=english+file+upper+intermediate+3rd+edition+student%27s+book+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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 11464 bytes
SHA-256: edbc84e95a83724a3a0615864ae3834fa9a561b63d40e2a8df5c31bd5a4210ec
font_02_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16444 bytes
SHA-256: f3558ca30de7d595dc7cfc76cd0fe2ace54a866f70a7229bfdb45ea00791f2d3

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