Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86431b2d0cfc800…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 10:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08930814034c5f48b787cc2201dd8564 SHA-1: 2ff94b98c0a142d0c8241ebbd49260d04fadfd20 SHA-256: b86431b2d0cfc80015ebb0b31a43f510ea953ab546f825505ff1a37b9857ec11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be luring users to external sites, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=compound+interest+maths+worksheet PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/tesaxivumamudafedipesod.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3cda0c9f14d8b9824044e9eb683d543e/nazonefijubawizixejoni.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c653b4cb8c7f30a3203bb7709809898b/waguzera.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/latopagetogak.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/77286364755.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/tawugirijivoto.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4316f39a47bf72083c35e8f07d455f7c/lizibadodekog.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/964eb9ce0137e7279efeb2bad47736b2/53847468680.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/13827762611.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/87107890827.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/giziwujovemoxulinun.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/435e2a48e29978120e9d2d94ce837e87/nosum.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/podavog.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45f4b53c2---fobarabowegokozuzarab.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/nezedajikewolaferofiri.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/13887306487.pdfIn PDF document text
    • https://limsurdua.com/contents/files/bipumadekefebinurab.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gokukim.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/15362489095.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6s1f1tanblqbll8b5qrca80qi2/guxidizukubemenebufagip.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/92951d4284160ae0bb85c7e7783b568e/tefupete.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0439627c---gerosukemanubojanulojutij.pdfIn PDF document text
    • 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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 10920 bytes
SHA-256: 9e1a293a21777774232e2665636ac201982f15490707eea29d6fea4802c142f0
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16732 bytes
SHA-256: ccdcf3dcd47426e19f11e4800a977a4016ec43170245ae757c58a7a89ecf818d
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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