Malicious PDF — malware analysis report

Static analysis result for SHA-256 18966ba57af51bc6…

MALICIOUS

PDF

195.2 KB Created: 2021-08-17 06:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec76bd9c5ba0d94737ae792e477b9302 SHA-1: 01da95e46097d7e9a98043eb231df40410de3f14 SHA-256: 18966ba57af51bc69a4b39a10e2ba141f1405922d07615dd289f458d9682a5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to leverage SEO for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9510

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d306a81c---20374605247.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e236fb5d0addd03ee6c29a7396e763cd/rugotomasuloluxopejivo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dbe574cc77060c10a5a0f8b63aa4afdf/83547025206.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078db5fdab2b---nisiwopisodezerux.pdfIn PDF document text
    • http://canadanur.com/resimler/files/81841973417.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/bavabefotulutul.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/kanubufevuvifapepule.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/wakezokeb.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tlsscamq5abhmqf9bqfcpri766/davakalawisixo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34b84b6fb---34196143985.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef233ed9a---16553939500.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/lazomun.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afabc56407d---62223865539.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kunitojiselozuwe.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/219fd2e4b61c45c15081800889df774f/kowur.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57554401e---66481984668.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c75172202---tavuwojuvabobozilu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fa9260ccd09021a6fad2c54430154132/ninafadevu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a31b4b9d7---11509369743.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae9306a64---81240669156.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04e32cf60---70450658382.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a17e4d7c44ee8f7c02371f5dc229a44a/dutorozov.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/fenezez.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/69f707ecb60c81838735091f8f53091f/42736712773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=khilafat+o+malookiat+pdf+archivePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0002dbbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DBBF 19568 bytes
SHA-256: 643a1a2ea2cb6fc13f2c7dacc901615b007884bacba8888c546aa8161f8436a2
font_00_sfnt_off0002794a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2794A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00029161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29161 10764 bytes
SHA-256: 3fc885f34565fe48bd8d69bc26d567ab9e5ed8ed423419dc53e8dda49f35a939
font_02_sfnt_off0002aa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA1A 19592 bytes
SHA-256: 8e1d1ddc50d0372c48e0dcad98297bdd7820374d75f2d28868ed0be0d8dbf310

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