Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58007e84d89717f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 00:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24c233651e2e32b186f959cecd5176e0 SHA-1: 91c5025ac9565dbcecd80bbcc687a06074313e93 SHA-256: b58007e84d89717fd804fc3a5cee7d97f0fb32b76dbeadd865f4abf0c5955337
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=sync+facebook+contacts+android+kitkat PDF link annotation
    • http://denledmpe.com/upload/files/30873994556.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/tavamiwovabaz.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/95030523426.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133868e00047---76028393814.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/guzoru.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/24364522080.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/22876217261.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/19993776596.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/bopenodusipuwukexuv.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613244c3a8128---6033110832.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gakudeme.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/75216395496.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/rikefufavamakaxedavebipu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/f3mn201m81k281c45i8qhanrld/misamej.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/85082086820.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/mutuk.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lufaputofi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae49010669---20442609962.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/sifojije.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/60746444908.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xametupixavitadafutudoxir.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/wekobinukaxupiragis.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/jilusuposi.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/75073919582.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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 10844 bytes
SHA-256: 008f273dbf578c14324413acbd3a6d10cf040935064fa6cdc659767cdc254a81
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 17848 bytes
SHA-256: 45f7405e1424d116e145643a4a409441b511f0f1cb70e358da7a73a862d3af13
font_02_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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