Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb2803a74f67e34…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 06:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 758f174d0b9a1bbf62d262c25d20e7c3 SHA-1: b19f924cf32c9e120dd312d0d5edcc73b3dcc4e3 SHA-256: 4cb2803a74f67e343c3763bcdcb34878235af9185a639c3fa962ed9afbb7191f
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further suggests a lure to trick users into clicking malicious links. No scripts were extracted, but the overall structure and URL findings point to a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=visual+studio+c%2B%2B+tutorial+pdf PDF link annotation
    • https://viettrungson.com/media/Files/68707608359.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/luwizabufubazewujuton.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904081029.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a032d52c---nurakowutebetatogedisumuv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6384fe1---sawujuneno.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6t3cm53i4qakl2ipn375dfecv4/lofukomu.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/98030748041.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/71474744407.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/zuwokimukixajuzuwatizag.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/revusigijetezivetipabu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/42c8335aa508efcbaa319afa263ef829/82302278550.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/boxafebubixajazumuluva.pdfIn PDF document text
    • http://onelove.cz/file/87860690961.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/55870436716.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/74d86a23eca1bba74581eb26e0466ee5/77817288451.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/wasuwawubose.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/rifavajupekuwebidewiban.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/26909846038.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480de64516---nikarezoporalevatiwilabu.pdfIn PDF document text
    • http://vhktn.at/images/content/files/52343324591.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/2394612141.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/98595484332.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210905_052921.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_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 10444 bytes
SHA-256: b718f86abfffa426bbaa31cc674847fed9ffa75019056c1a3113557bee3c9eb1
font_01_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 19124 bytes
SHA-256: b33613b72a985053c706b1a258bbdc871e37f06613583b8937b9df974604c154

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