Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7efcb148e496aa5…

MALICIOUS

PDF

90.2 KB Created: 2021-09-12 07:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 414f99fac13862a7b411b1556b13aa49 SHA-1: 9df721e381de17a6fda044af5331527198d6be47 SHA-256: b7efcb148e496aa55beea585d0c2c4cc6f91858b25f3bbd234ec57a85bbb0d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9a975205ea418ea73d0831de1ffce5b5/womuxojidig.pdf In PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://global-product.org/CKEdit/upload/files/depetapojapipewif.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63840684849.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/levepirenefekotup.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/09/file/20210909_123738_173.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/9579552598.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d0c423762db40b233cd8f200ac199554/miwepuxowewurapim.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/02aba4a772e2211f2da2a0948c192cd9/87909512201.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/sedawakutukobo.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/83900176288.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/90157597016.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/62461332275.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/10381226818.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/76284105816.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43ad34057---pukakonuwozolol.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/92862800191.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210911022908.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161322d60942a6---kumokupofusobovove.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/jimukifefed.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lipinafosazelewomi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/ritumejukububumuvejanu.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/kitugogibideraligixubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+movie+kodi+addons+2021PDF 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_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 19196 bytes
SHA-256: 844c31b07d1d203ce3ddfd86296c1642a082b109f54628fe087894f291004d08
font_01_sfnt_off00012a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001423c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423C 10768 bytes
SHA-256: 7231c1edf5a726484b2cbe80611f9709a59537eb8d5a8d16c56763074bb6a5c5

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