Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf7d80345ea0893…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 09:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e82e028915c82d2a9ea8d9c37864b5b6 SHA-1: ea66b0f7cc3f1221d42ef9ddcf9eda9eacc3713f SHA-256: acf7d80345ea0893477c55e1f6f20f2aaae24a495efdce164413e3d84072d4f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=bts+pleural+disease+guideline+2010+pdf PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d96gsfrnsm4esdnumvs08hjq2r/koxojizimekuwekezofuk.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/47835043534.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/xamidarusudij.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f0a9fa0b---xuludarizusufifedap.pdfIn PDF document text
    • http://le383.com/uploads/files/kuwatawuvajidadof.pdfIn PDF document text
    • https://rm-parketi.si/uploads/jebitalifamibipos.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/vasadexi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078725f488a9---10234869241.pdfIn PDF document text
    • https://rm-parketi.si/uploads/lirubi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4c5ea616e2c81b830abae09f44397da4/58442907126.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/69317856270.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5daf35d775---23457141231.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/27117874028.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kajasagutuwibebumub.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fba52b94f---daduwes.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533bf6a86a---56272801147.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/kunek.pdfIn PDF document text
    • https://anfauglir.com/images/file/vagalisijeviworejulerazog.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1ea13e290---pudefunawofenotolu.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/buxinejotewejowojaximaje.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/bomisimiwisepadeged.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/lovemo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161802117874.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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 11000 bytes
SHA-256: 9915fd4cca8d392c15a538c4fa269be599fa2f1acea274ce002be43c46f24a58
font_02_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 18480 bytes
SHA-256: fd23581dbbed47e81cc6cad4187cda640ba77b82ac204ccfecaa082e1bb6d5ce

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