Malicious PDF — malware analysis report

Static analysis result for SHA-256 9304b10187eb8c59…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 20:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5594dad5355020ba6bb59ad32cfaa6ad SHA-1: 168ac7c7423eee0b8106c64e8bddc4adf1bab836 SHA-256: 9304b10187eb8c59b53dc9bc6d239dd3cafe2ef285f0f1d00be4c70c35fcd114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=terapia+familiar+libro+pdf PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc281d0f4c4---5780095538.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ofuc27d1oq5tjokkqlfq7balff/23239261038.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/xejabitew.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/22151717425.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kidasiwubimix.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/77084484577.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076602f532df---29100591830.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e3eec02f7cc5d187adac10f5c0bb441b/17589390555.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/aedf250015cf8e4313cf67b62f1396ce/68121343786.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/af11876e00d8aa70197f1feaa0fa5c4f/29125960751.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/tuvakalukeraruxuwetan.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/nupodosejulefubelobaz.pdfIn PDF document text
    • http://ellev.fr/upload/files/suzuwufunejunidegupem.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/8d07ba0c4c8647564dd74a22a6e7ad7a/pumuriresarikogupagi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f784dd0706---64146941326.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/76777072155.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37f767b76---pudezoxofipotuzatimalamib.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a271be2d42d---karozapabujewinutiluxugip.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/98950967402.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/553c8346570ef98d7c38049efba5402f/zimibojabidibosu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/36662543301.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20dfc62c4---32062802074.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d82ba3aaa3730adab2d88add3096fce1/46687202335.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/64693305941.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_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 18504 bytes
SHA-256: 9672e3fb0f608da576a91bb708b7e3c890d2b7124868a25bb51038b43c4c1be7
font_01_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 10392 bytes
SHA-256: d4bfa41fd76fe22e9cc170f2eec220369eba34864b2e1333f711b11a50f02099
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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