Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcee6c6518317a73…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 02:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8009b92222a3be8d7da625eedde446a SHA-1: 56711a21591de4cbdcd2fe3254b650f79419170a SHA-256: bcee6c6518317a73f8aab34f401742b54f6dd283a8cf392d76aea13797802c34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=clash+of+clans+my+bot PDF link annotation
    • http://sunmoon-glory.com/web/upload/files/xawuxalexenulosemowaduxul.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/97iu7gumlf77f0rc238n8h7da5/luzajasedilovizivobomasaj.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48a7534a5933da1ef5432b364120f7f9/69171131363.pdfIn PDF document text
    • https://ptogel2.com/contents/files/59662311973.pdfIn PDF document text
    • https://eclearusa.com/images/file/xonesanunufikopaku.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/7473459426.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/61516440303.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323db44289b---vakefufuwesuda.pdfIn PDF document text
    • http://dsraxys.com/uploads/81614116960.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/17460845962.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/kibivexapew.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/66392409057.pdfIn PDF document text
    • https://vzglavniki.net/data/file/moket.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/18473852728.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/supobupixujuvu.pdfIn PDF document text
    • https://tipresentoio.it/images/file/jorolilagovuvomuvude.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/27633316199.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143973fda83d---79097602019.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/vukevomawemurudesoxis.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/bajivotovat.pdfIn PDF document text
    • http://innotack.com/userfiles/files/47899128496.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/zobujekagaruda.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/42839032935.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kekebafawepibikulakuv.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_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 10560 bytes
SHA-256: 21ce1e0c2d8e464c52569220cf0cfd4700b6ac7f85e159b117b86830cb83d05d
font_01_sfnt_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 17580 bytes
SHA-256: 2622701d1508b65b2c33a99a2a4f446da6b667ead06334929f0aa169639f3cae

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