Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d49c8bcbb06074…

MALICIOUS

PDF

101.3 KB Created: 2021-08-12 07:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1a85b8457cd83c7fff1961af73de07ee SHA-1: d5e72f630943e15d4ff970f84287dd0adfe6d6c1 SHA-256: 99d49c8bcbb060746dc6db3b4c76b24a9a7ed7587560e477cfc3914cdeedcb37
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/788f74b249ebccfbcddc095556e131e1/49985516799.pdf In PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/99273863776.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/90048713111.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kikigugedolirufiwe.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608635d9217af---vevovepatixediwu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d7fdfada4391785187b7b4fd73c9fe52/nesojilopebulinizexekuju.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/fezejurewuneronarifotegon.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e767b7bdd4---diratepodipoduvuk.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c666bd3c84d---mebowupixepowedagojufufaw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5cb9e877---tosivafogisivefemijurutu.pdfIn PDF document text
    • https://alutat.com/data/file/xonekevekenatunosev.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/luputuw.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8834f259f---tavelozeforaweju.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/92609131058.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/52902496043.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e3474d98ea9bda7db955e9f27cc46e17/gulalasawuwuk.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091a47aaeaf5---79988591049.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa319b11127---tokariwotutejivu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3d6806244bfa560ab709f10ecf40c4a1/fefalinuwomu.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/53312256149.pdfIn PDF document text
    • http://gabortech.com/admin/file/nojavagogidowuniwip.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/gubepixorula.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d66815bd8---zuwirozip.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/18789070989.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e7ec5ca7b8af41bfdae2969dfaa50a4a/29618708012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+prank+call+from+another+numberPDF 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_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 10892 bytes
SHA-256: 2de544d9ae55f3e7deab067c0f49b500db4ce9fc3fa037ce655b3be9e669a918
font_01_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 18264 bytes
SHA-256: 32a20e8583de896e7f020e531fa63e0d3fafce284c0fe7d212d661384c8d5ec9
font_02_sfnt_off00016e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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