Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbe1f1106884b50…

MALICIOUS

PDF

79.7 KB Created: 2021-10-13 19:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3ed5ee818173690f74a54e79e514f0b SHA-1: c8676b820095fca1026e6b8e224db4413e073e89 SHA-256: 2cbe1f1106884b50726aeeaa707303d5c7b459524543122fd3a7413067a67851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=alcatel+lucent+manual+4029 PDF link annotation
    • https://probidjp.com/ckfinder/userfiles/files/20211004_190710.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/tibaloxoxasokokumumi.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/33609645741.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/86991406288.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/18406249111.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/12883259813.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/paxupojadiwifekopijegep.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157038533506---38624180643.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/25384274665.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jamolunugiziwopov.pdfIn PDF document text
    • http://allycatering.com/userfiles/4336802318.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/wolojumoturibaki.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147ee7a86865---pavogegizisezu.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/totipetawise.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/wazulagutibisonim.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tazuxur.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5odnuausd8v9m0ngrjgsfbjraa/gomamexupuregi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/pesividiwu.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/kirubi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161387d3871c98---38335751989.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/lavolevudumawumetusolawu.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/41680106194.pdfIn PDF document text
    • http://scsytech.com/upload/files/suwimigibudojo.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/soxoromidikujolemularud.pdfIn PDF document text
    • http://mastervin.ru/files/file/29708307850.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/sipexabukunufaxodebuwirem.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_off0000cd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10480 bytes
SHA-256: 59d07113f9214a4c645bd82936f160865bf5b9925f60a6c74ca1001c84e75a92
font_02_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 19852 bytes
SHA-256: 20444e1cdc06b0c3af60d4c128d8c3c2d7d6599a94556a442947361865b53d1f

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