Malicious PDF — malware analysis report

Static analysis result for SHA-256 5902dca99121253a…

MALICIOUS

PDF

99.4 KB Created: 2021-09-07 19:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2aa31839930ac0a24fd7b1da40393685 SHA-1: dc6ef9cd7ae684a5b500eb55d8cdccec86ee1985 SHA-256: 5902dca99121253a0ceb416d5d8269f22ce65e9f0421aef5fd9a559e3f6b8694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://namlongadc.com/uploads/news/files/tafijekejoduzowa.pdf In PDF document text
    • http://jentretiens.ch/uploadimage/98419625050.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7c69ecaf1f3dc70c3306de2b7db1ff47/96751869834.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/xavos.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c9b5f6c8a7ac67dc5d147a7167cda84e/kivak.pdfIn PDF document text
    • http://nenorm.com/files/files/lugadaredarivudas.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/muwovazilibusu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c7239af5ab2afeb8915684ffb0c94c33/mojononuf.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nibipusemovigidubupe.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d061f89cc16---wajulosuwesor.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610082f18a2b6---83768465502.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/95892966978.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/s0avkfsebu8jmolt4ibsldgi0o/nozajanavekib.pdfIn PDF document text
    • http://dakmet.pl/upload/73451923169.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfecd6a5cd8---48450446899.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qbbkd2hoaa54fajgf8gcokekll/30013496939.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/it3u0v0e6msvt91qnpg2375oj2/zilesiraviwuj.pdfIn PDF document text
    • http://simonide.org/userfiles/file/busis.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ae0b5c6058339da26758be745f0c5f5b/zadirodixarizedun.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/68af864467e9b663b71c91e66aef384a/88589931572.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/26836180927.pdfIn PDF document text
    • http://topas.lt/userfiles/file/79218488592.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/josefirufatiwekataboxojar.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/15940378506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=les+objectifs+de+l%27am%C3%A9nagement+du+territoire+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_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 11476 bytes
SHA-256: 6c9fb6b0524c799f50302d172f9852381d3e379bb56b53a1b5f4a3f1327f89cf
font_01_sfnt_off000130de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DE 21440 bytes
SHA-256: 09528743ed6e34d8a63ac66ab505e0b54f53248e2eaf4852269bd477b6af7a0a
font_02_sfnt_off000164e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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