Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9760b88bc336314…

MALICIOUS

PDF

124.8 KB Created: 2021-09-03 04:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c979f75b17fa83115922639054c22b1d SHA-1: b85e9bc70e7d714fee506d8b0af9568c0c417f12 SHA-256: b9760b88bc3363141f1c7168534323ec6998f0cf40c1ed1380b8cade1e00345f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/juzemakavefenefur.pdf In PDF document text
    • http://1utilaje.ro/mm/file/xaguzaxafidagowif.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c05526a4---wijubiwulubuwofi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/efbff58064a76e47254383bab96eba40/67483009835.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/32559504795.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c344296c9afb4ce15279c65959301798/69588724674.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/74635687426.pdfIn PDF document text
    • http://salkim.com/userfiles/file/96780547540.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/40054410065.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/fotudaxigikuto.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf07858a1---5561895348.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/kerefosirekafudutobolepat.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fefb809f---90791328755.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445d918090---79322389316.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986798162---71072193162.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/24060517670.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/24251292463.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/10877019307.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24150854034.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6f234a8d035929ca99ee96a88aef87f9/3496985059.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/taxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=curso+de+candomble+pdfPDF link annotation
    • https://lapdonline.org/file/wijitab.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_off00017889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17889 22748 bytes
SHA-256: 06f4039fa7478966421c127f935b55e8fe26b27f46dc778325879cd864c5c888
font_01_sfnt_off0001b35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B35A 10860 bytes
SHA-256: 6d9eef803fa62f222ca814f6c91cecf6ffc467017a52b6f374d552ab5b48b305
font_02_sfnt_off0001cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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