Malicious PDF — malware analysis report

Static analysis result for SHA-256 59828b6f45496890…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 14:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98350e8bd6715c57f0b34c179d227985 SHA-1: 254327513ed298bae32bffe87880d450810414a5 SHA-256: 59828b6f454968903a63c7df27f4866b1ce10d158bff89db472d6f2eb06d7a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=the+sunlit+night+stream PDF link annotation
    • https://2acontractor.it/images/file/potikaximigajivonawinoki.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/niwipazivosolu.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/10009905227.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/pupetisegimukozas.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/kipuzo.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/ririx.pdfIn PDF document text
    • http://teifsepahan.com/files/file/jexiterifup.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4abb9aeb---zalozekasatozitogibuke.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/43113399334.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/35528916550.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/foleziji.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/55747878150.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/dusegopodipiliv.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/9634764653.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/mibibexe.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161403c028e22c---lalanazabawuberek.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03f484e5a---dojurowet.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/8517555791.pdfIn PDF document text
    • http://mobitransjogja.com/files/47745500561.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/18908053048.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/973op0qp999bn99d6nm1ar8a35/sebobologepa.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/61868463007.pdfIn PDF document text
    • http://vaynhe.com/upload/files/givifa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c624a3f1f3---pedujurisisatasawepiwuka.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2540800BA9E92B45.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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 18580 bytes
SHA-256: f29d42647b43eacbd9d71fe6532445360eca569f72282bea1311611a1ba096e3
font_02_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 10496 bytes
SHA-256: 0bbc853ce16715ecac3775491f62d7b4ea9d4bbc913a75d783aeec9b5f0ca0af

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