Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b4de95c79ce217…

MALICIOUS

PDF

86.8 KB Created: 2021-07-18 10:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25b647747b56df2ed48773ed0638fde7 SHA-1: de658ab5a5ed0ce846b8191283fd4b32c4823937 SHA-256: b2b4de95c79ce21792e2dc63eb486a0fe547d57abb3d357f6651e17322e94b56
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a redirect to a malicious site. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amatnieks.lv/pictures/image/suvulafaxe.pdf In PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zonofovuf.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/gojonatojewalut.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0b39f817---vijetavixotapamedimoxon.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa5e69a0fd---25856156405.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/61858345315.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817001ca205---19652839837.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b548d05df5---29981935130.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/38257265293.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4adba55c73088afc2c39ac2ef18daa47/37795899631.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/pupokamesadulewodoti.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed4edeb74---72513556924.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/38093454372.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c79b80530596625343f57dee63f87086/47080835013.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217101966215.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/judixegonam.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/rebokagumixugagovipuk.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bojav.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fbd5801d---84468928644.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e1d563521519012d86681411377fb03/9546444943.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/62dda860ca30ad0d29349a0a6ebb5b88/xuvalilowalojalejovetawa.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/fodaribujofegawujagupixo.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vofafuvagi.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/29623825897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=an+example+of+a+research+proposal+pdfPDF link annotation
    • 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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10776 bytes
SHA-256: 4d50458603f21950247496a2502687833fb8cffd55ee0b7104794edef9c65db7
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16968 bytes
SHA-256: e514d695a435423612d1d11eb168923029f57f20eb475bdd1c910f7237f0c40e

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