Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf31af9d0adadf3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 14:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31516d39ab7257498e42814c0e0f2de5 SHA-1: cf62bbbfb197c9720b0789ae99dbacf2f2b75b24 SHA-256: 2bf31af9d0adadf3b19171c1f08a90e25b79075e50df4a694d12198db659174f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=silence+2016+full+movie PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/20476701132.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/55981962610.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/vejodaxulirupixodezo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161346a5785fe0---ruxolarupegaziwa.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/32642921802.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/serukupanibazo.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/ligexexagasedozig.pdfIn PDF document text
    • http://pedraferro.com/files/files/57204988684.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/jebefigupazanituxip.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/70528331531.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121231226389.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/genotujadewivaxevuxegobes.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/141221394959.pdfIn PDF document text
    • https://eclearusa.com/images/file/5527030764.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144716a2fba7---gupudalakasafodaki.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb4d39b59---56426267738.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/ponarejevobopijisulu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/771ca364cc0bc3e4aa7b9f63c8d21e22/pominopiwejupexogun.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137ca2660123---68956008180.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/84156699777.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/lekijoxes.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b30d64bd3dd67cab4411a75573987b49/56633817531.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/jaxowuraji.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/53885564459.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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 17260 bytes
SHA-256: 20bb3b96e481dd4f6a4897406ce4f86ffcd5ffc0f25a97cc39e9a359bc79a2cd
font_01_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 10672 bytes
SHA-256: 83c366eae4c44f524d794b5b448f89fe1fc8bf0fd1c94333fd09bcd713280e1b
font_02_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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