Malicious PDF — malware analysis report

Static analysis result for SHA-256 24498f504e3ea031…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 21:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7590e2d964e3a9d903c5c5210961ad0 SHA-1: 624df4f8338d6d15e25af7df662ee9190683d272 SHA-256: 24498f504e3ea031c226d150c09cc6430b81e5239ce18d00a1a9c2d8928a0c66
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. These links are presented in a link farm pattern, suggesting an attempt to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=2008+dodge+magnum+service+manual PDF link annotation
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/wivoburigebaridixofow.pdfIn PDF document text
    • http://jp-cable.com/d/files/32602662522.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/tasugikadasiwizolib.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/baxenopodilekalu.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/xipunubugelotod.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210707192931.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zilenodesefivaruka.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978793a4935---31704096315.pdfIn PDF document text
    • http://cke.hk/userfiles/walidi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/29079601174.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/nudaziju.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/11371183494.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/81344125661.pdfIn PDF document text
    • https://agatanorek.com/files/file/23932048956.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210516090533921.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae19cd2b5---nivikozurolosowibom.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4b65acd7f23636220558366da2ab5be0/24509333859.pdfIn PDF document text
    • http://keacg.com/upload/files/jajudivamulunokogopu.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/49619690643.pdfIn PDF document text
    • http://ligneus.hu/upload/file/figufijupekagir.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/tc3hjvds6vpbs7b7j99nsk6ck8/jenitafug.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085750abee62---7347358144.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wobidabuniferisulojezime.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50e78667e---pekulit.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_off0000ba8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 16832 bytes
SHA-256: 440b7cf670628888564bd8a294ddd32be2b383c29cb643ea10558c22b434d459
font_02_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 11132 bytes
SHA-256: 439a9e5925ebfbfdc0aec9afac25239014f5908f8845eb8287d823aa2e26bdd3

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