Malicious PDF — malware analysis report

Static analysis result for SHA-256 691c9183b335a8e2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 10:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 400f88ce2711d8c6a43f2926f32dc00c SHA-1: 27ed98934a3a4ff311b2bbe70d2fe6ae3933617b SHA-256: 691c9183b335a8e207bf2d1928ee45fc1fef6a26a3888b3c222375907203d859
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kermiradiatoriai.lt/images/files/22929584909.pdf In PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/94582927218.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0e03e9eb---safezudopoxorififokinis.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/276cbed5045b70bba074823ac41e4428/74455471269.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/muxerebo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/biroko.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1f18586c52ded1cd5c3865a8c6187f71/62082275108.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9a95178jq5u972lorcdum4q9ce/xeposaraxexisilumoraxat.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec436aa60ed---mewawosokes.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/a0n7mtpeurm6vcnli5m07f0h8k/94902892730.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/setilivaxovurinifavebezat.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e69ceed4b---43548363247.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wopota.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/87629325971.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/42177199658.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/kafujuzorikumonu.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210824_074257.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/folirogonemakifa.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/44779100676.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6300725e---davoputupikozikitafi.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/dusetirovelutabajuxotuzu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161141382843d0---70140481546.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/59104895983.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/77371976819.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095974a36978---61950537600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=consultative+sales+training+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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 17708 bytes
SHA-256: 5b2e5badf448a6c8de4796c46439fe2728cddcc27fc6fec8e842c3d5ce1b6a4c
font_02_sfnt_off000129fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FC 10872 bytes
SHA-256: 15394c146ec914117e4093ad03926522f4938289cbc02cc5ed4098f41249f570

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