Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47ca6622ee6bfc5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 02:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ef4d9438a850b3254a0c1d283f707eb SHA-1: 96d8b321eb4606ce7b00ac6d18940560ab2122bb SHA-256: c47ca6622ee6bfc53f70ac740db384c1be665fff95c72fe3456edd1ff0e685e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=boku+no+hero+season+5+release+date PDF link annotation
    • http://sanarina-coaching.de/ckfinder/userfiles/files/zufiki.pdfIn PDF document text
    • http://mopron.ru/upload/files/nejewes.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/65159786174.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/gojulodofugagujefoz.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/gadoweneravarogagazetimun.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/puburudebatiwofaxa.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210925102323.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/sedubobulitadezafevunu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ea2058eb9---puledupanoj.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tevipubovubakawu.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/42903089910.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/sabiw.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/73594416349.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/kabevodaso.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/logukajuzobaxo.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/xudadeluxoremomapi.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/paxenokubepif.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/iom04ci0mvrscdejl7osr1spe6/65366385145.pdfIn PDF document text
    • http://schokofontaene.de/idata/riwafomuwenabajew.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/muzewefujila.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/24015543294.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/61868906711.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161417345343cc---rapebamudetan.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_off0000b29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29E 17192 bytes
SHA-256: 636febddfa4003e4889012c197b494197d4e85d425ded1caa715a7792485806d
font_01_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 10632 bytes
SHA-256: 7485e0032976553d28a9b846dd344607f50a4e42060b4d36f0c2cf960ac7f0d9
font_02_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1