Malicious PDF — malware analysis report

Static analysis result for SHA-256 789bc10bf56e994f…

MALICIOUS

PDF

115.8 KB Created: 2021-06-09 08:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 139e75c818da80a9cab2487a43dd064e SHA-1: 5347fcd595733680d7bd324d6062e82526c76162 SHA-256: 789bc10bf56e994fa8d6b5303dcbcfabe557070d1f4a70996d18bcbb019408d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. The presence of a direct link with a 'download minecraft' query parameter indicates a phishing lure to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/uplcv?utm_term=download+minecraft+java+edition+1.15+free+for+pc PDF link annotation
    • https://pima-alarms.net/slicice/file/50232863533.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ef1e6b2c---diwegedawowusomosobefudum.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/99452695214.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753a8685af7---85000069060.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/66be53651b888824cb877e1d82b5c735/rurifosidazizopim.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/87414040071.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wixenesomazizixagigare.pdfIn PDF document text
    • http://drironcat.com/images/file/64168345948.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/notemufezobo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e87cb64f---52173107635.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d8facd3b1dac42ab3a8cedf7e7762d5b/64490447536.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a40dc9a8819---tefexef.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082806446efa---36306372089.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/pa4rri34ojahapcv1kl963tupt/tevalegibagalijogejoroj.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5d4ee78000a5f816771848411f264b6f/zusixosiwatedopebezu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gvu33njhkpfvmg7eoq0p1v2ij7/nutudixop.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jomadunejukid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00016ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECD 5560 bytes
SHA-256: e00efec58e15e7e20f195185e8b2a24a5505c637429e09b08b1c0fb37b7ac230
font_01_sfnt_off000181d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D2 12356 bytes
SHA-256: b4059a81e9b75a5febd1128b3dae8a8217e47b6b331b3f77ecd8840a382415e3
font_02_sfnt_off0001abef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABEF 16104 bytes
SHA-256: c72ca0970d51b0a8ad78cefeb5ce5696832e14da31bd2128a4ba9c3d04a16bf4