Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3d970f82620db2…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 08:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2135ba4035f73b658eb9b241d9d49164 SHA-1: 7da9f2690ce395cf97985f6be856311bd63bb0d1 SHA-256: 0b3d970f82620db2233a6640feba2bd26c1b4e4b3571ac588af1faa1e2c1cc85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites, leveraging a technique often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=google+image+search+android+chrome PDF link annotation
    • http://www.anaja-inter.org/public/file/22689699650.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5306379798903416639fca06571bdb3f/58100992250.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/80715706831.pdfIn PDF document text
    • https://istanajp.net/contents/files/jokidetasidipix.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/25807123142.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/13754675122.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/lusobonuwumo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a9c2f2b30223f6fda29f2840d496e07d/69308396109.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/92842194547.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/5993011027.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_095856.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/26537053984.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/18098387294.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/sizuputivibajiwejidiliwaw.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/927a3b2426fdbacbdacf70068acac455/xiwiranalinarugeku.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/leriwudigexibafekedexovet.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nevonoseg.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/jopuniwukibo.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/45670267081.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613083b2c5ee9---mipojaxabulu.pdfIn PDF document text
    • http://devveb.net/userfiles/file/28876095810.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090712542973499.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/sulujisajisovebitiwanaro.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nereduvixete.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_off0000ae85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE85 14520 bytes
SHA-256: a2dc93f6abd3d1d94068c89cd0fc00970718a45c8c6f63f81353b42d4a812aba
font_01_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 10760 bytes
SHA-256: b63342e84d2b6697c91014d33d3b72eb3b9d24b9ce64a3d9778e7c4fc8662e07

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