Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbb487886201e97…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 08:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38240b74ce10c2a15ea15cd332b3fd7c SHA-1: c097edbe003df43935aa15c536ffb24c63a71d46 SHA-256: 3bbb487886201e97abdae26d852d411de9fd3d1d8b23ea6c13e719b0741cd237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malicious content delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external malicious sites, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://airbays.com/userfiles/file/xokuzinijamoxixo.pdf In PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f332fcbe89452bfd6bb07f2cdc539eb0/27151034426.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/71537851677.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf2660d3e2d4726aa99247f9f4bccf09/73168300408.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd5f7574f3---16266835202.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/11728150218.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/45721038735.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jefitud.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca747e806---xilajisumijub.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/95035495653.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210530130116.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/ponepenavepifokexe.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d6934fed0---tojifuroxewifuzozo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1acef96029---jimevegurununolebik.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d19c2899e0dd13ff1b010e7abef5dd31/52019857332.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/96283765477.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/348d685d5f1d4bc39347e5dd2a26d1ef/wefewojajo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4cd259d4373d1a86f5742fc58c98c260/74545444707.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b985a6553b1---jiparexezofenizesilamulu.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210811_09564B0FF6A72BC7.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bba7b838d4a---53513221975.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/fibegalubamusepuxozimavov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=all+engrams+ark+commandPDF 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_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 17228 bytes
SHA-256: 650afccaa92aa4483b47e70cc36da78fc97944bb5a3974148ca632622136c8d8
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 10596 bytes
SHA-256: 456aab22f993c57f91d01ecddfffaa57178504bd7c240578d4a06cbfb4130dee

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