Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bb43c39dc43390…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 06:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f3fca1ad7c78262646fe8c7a4cd827a SHA-1: 1b11c22843d00f798a3644c2c5c1ee44a7138fef SHA-256: 57bb43c39dc4339020cba4c7362ba545841bf34735fee8f6291bf508268554e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one that appears to be a lure for removing a pattern lock screen. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=how+do+i+remove+a+pattern+lock+screen PDF link annotation
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141afe9458ca---3927223496.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/80531307147.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/zatilo.pdfIn PDF document text
    • http://irinabailey.com/upload/files/zapamenewikiviwe.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/76768878780.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tenosobidov.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/47655899742.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f1c107ff---zoniviguvetimuziwojori.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/16019305555.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1eda6edf---74256657373.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/zexagasulaser.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/54962587969.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/68928826678.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/67715078037.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/vumelo.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/11293379720.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/77533626183.pdfIn PDF document text
    • https://chv.vn/userfiles/file/14092401795.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/61684125339.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/ziwibunonupokedovedivib.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/20512768905.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/bafularasedufijarumo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/93901081704.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/34560904321.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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 17952 bytes
SHA-256: 9c73ee0ea3479d7e2f4f6aa93c1829f6a73a5395bd977ceb705304675417147d
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 10908 bytes
SHA-256: 58b5abd3d0ef44828439e50489828cd48c7b0e65c254dd4885ec9f64f180a282

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