Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce37f5ff81c7232b…

MALICIOUS

PDF

136.5 KB Created: 2021-07-08 05:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b82bc2d58ce8d9109f21beaa72ab2f3d SHA-1: 5d303d09ec3a69bbd02e05d947570333e756fabb SHA-256: ce37f5ff81c7232ba13dea25032fea97c44ed46567bf76c12a34949f6e3991c9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://synerhu.ru/uplcv?utm_term=how+to+play+new+phone+who+dis PDF link annotation
    • https://esperanzadeavila.com/fotos/file/rofenuvojosufipofetogo.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/tipase.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1oj4f2h3h53e4p82ft4b3obhh6/26098627097.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6efd369177fee71f32fadff4a624d31c/44778169222.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/kofugumadoxogorofujo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/29643822811.pdfIn PDF document text
    • https://cristalensi.com/public/File/423924373.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ci5h6sght14medf23lt5h2njc1/nuxikelurujubigobak.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/bokoxinokugekewexikilivu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/89873444647.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8qjvsl2jl948vr3agtn47i7d4k/23340428819.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3117367396---fazezeluxotenegadumigibod.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9gth0pgim82c9t9oiei03e3gu2/tuneperilanunagimanerap.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abbca96a0ac---60793249188.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ramasgc7lulaiaph5cdjk598n6/51473140371.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c951288c698---kamejipibulupawupot.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160856b3dbb505---ruderevudujiduxexalew.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/23614568984.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7a4a0ed12976d4d9e35dc371846f618b/79897139261.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a518fa8d815---pegifutaturepemuzelas.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6f04fb79ab0249b0f5d0f643a3d206c5/62505752783.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gj19u3v59pnl44csmmb5o5adk1/magedujorulebamudipivef.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb4f00f8c---xaxawipaxufolitamovironab.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/98885081832.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/61986388117.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c749705dd30---19779726633.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4DB 18016 bytes
SHA-256: e4f765216a20e7f87aa6e4b2d1eb512bd5c33cc9fb4090688df8a217cb7ead09
font_01_sfnt_off0001e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3EA 10580 bytes
SHA-256: 1f63cc1b71cbdc3ae33513ad7845e877c8728e9344d546723345ebd20da32685
font_02_sfnt_off0001fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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