Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41468db180e3fa3…

MALICIOUS

PDF

81.9 KB Created: 2021-10-04 22:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9880dd6ea0677dbcd54cbe8ccd490e43 SHA-1: cc325c9d3874294b2a898478a89b84e028d2236c SHA-256: c41468db180e3fa32d299fef016ac4cd2179d0e70c70c10987c1b42011d7c31e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=lucky+block+command+2020 PDF link annotation
    • http://dpnovelty.com/upload/files/rusupivota.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/41886319388.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/kudorugu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4q8jfb8c8f7oblg1cobhanuhfj/majalasitekog.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/39555677098.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/26189245781.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109098593_169967208.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/70937767261.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/xokujiniwabanugif.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/lojemutamuluzeloguzisilep.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/vufepuvavuribarid.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/sazeweribolagigitoju.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f66354878---48121429722.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/27455465499.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/torobijevepuzidipubekusup.pdfIn PDF document text
    • https://pratham.one/file/jajuzewamenopepanemupobo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec48c26f8---zagitun.pdfIn PDF document text
    • http://orthodoxnews.us/file/14171015547.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/33587241390.pdfIn PDF document text
    • http://www.socfertenviron.org/cmsfile/contentfiles/45362132993.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ef22b9ef---wafumode.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/69934311524.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/47092da16de89bac3d1f2f59e4211e51.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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 21844 bytes
SHA-256: 89b1e7d24ec1d522b716825f585fd42a2340f1116f2d952d51f99686e05ff25e
font_01_sfnt_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 10588 bytes
SHA-256: be97640f2000f93322d3c1c3f8e08c1475be151a7bdbfb52df4063aaaad566f8

Open this report in the interactive analyzer, or submit your own file for analysis.