Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf0f2cf6afe4698…

MALICIOUS

PDF

99.9 KB Created: 2021-06-24 05:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9c34bfcb4f6d930586661245945e6c4d SHA-1: 669384e448a4d1a77b43c1e9134866f8df5b2bbd SHA-256: 9bf0f2cf6afe4698bcfaf1eb93695f755180aa806105675c881276384e59ca1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of external URLs and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://ketchas.ru/uplcv?utm_term=the+impossible+quiz+demo+answers PDF link annotation
    • http://hrzservices.com/uploadfiles/file/devonijilud.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/71832888560.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fcc5d975---71806662178.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/butoremofiwenikus.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8afd2acd417935c846a93272f3d75d7d/jogifixedejenugofuwe.pdfIn PDF document text
    • http://geodez.com/pliki/file/44456290243.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/99a3020457f66944a4a3b3732cf599a1/vidukexavomisixobogodolar.pdfIn PDF document text
    • http://chromoink.com/updates/file/fifapabawi.pdfIn PDF document text
    • http://kasargod.net/uploads/file/62308183108.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/24fd1d68141c4f8a45d0074a267e4c55/jozogujenisog.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8cadb8c5---bulojizufofe.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50f7b0039---jagulufilefepelafiso.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/kaxodulirodubafusatu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d940063d56---pedoxe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l7q0nlu99m7e4ode34o7e6l1jk/59795078030.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1cb385530327f9e986c64fd7de6c2134/75251367995.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790a1284eb9---lusirutosif.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/53b8a92bc93425c00c666cd9989b9d6b/ramifuwupatonotal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 6416 bytes
SHA-256: 62deedb54aaef669db635f4ef87d4bda5d475a8bf20633d6b56d9e4ab12fd410
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 5556 bytes
SHA-256: 8e825f23d8e51d7e8a60ab2c37f2379553a250361ca178f903c62897c8ee5acd
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 11528 bytes
SHA-256: e8851b2e92c92a18092f1010394b4beea4647c2c2d3137b7645b6e6a5eae0a64
font_03_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 11024 bytes
SHA-256: 63f61c940e7379de58f97c8c5a539db85ec41aee74bf25ed273a5b7bf9937974
font_04_sfnt_off0001643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643D 16256 bytes
SHA-256: ade860a384e0436df56bb84eeed4a9486ec680d7c8981cdb0c3745c5e2239263
font_05_sfnt_off00017998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17998 1740 bytes
SHA-256: e51ca0148e7e0aae4eb42a5f75a65a08a0f66e9857e45ec5485c6aa46bc5905c

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