Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbf4a649b87911d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 02:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df7a6dac79d8b75dbbe6cf45b071d9b2 SHA-1: 5a86990e8040af2b604d4ef3c078813d7bfb5bb4 SHA-256: ebbf4a649b87911da5fd9a9f74fc4535bb0823981c03f425fbe6b4bdb59de6ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/oufa443jdgp97jvnmvajo8cphh/95672832600.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ecfc46541ad4f565d89879ac89346d92/34888259689.pdfIn PDF document text
    • http://355353.ru/userfiles/file/kafozudagom.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/42c400e16c1edb0ef88b2253e28b909e/49042774736.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210830142926_oevdbs.pdfIn PDF document text
    • https://alohasafaris.com/files/galumaravebaripejarofu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fvre5np3v1v4jj7j42nl9ilji9/kekemokavenojumogunisasu.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/tivix.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/48410142356.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b609e872---83707057713.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fqohnvbod9lpt6fhpdg53abclc/nozujisutuxetejajafe.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/mejozikus.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/40466545211.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/watodefadomatisov.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484b2302c9---gezusupepozelonob.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/77571492563.pdfIn PDF document text
    • https://o-dance.com/upload/files/71668411668.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/44122156964.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/msnr4u5uj2j6j4ll5nfpdq7381/nabivoxobutapefejiwam.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2rv5ccf4jjq3n6uuq6rqk1k5ge/tasapepujari.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/360524606.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c3e3d9a5---kemolozapezed.pdfIn PDF document text
    • http://guowangcable.com/d/files/bujebewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=physical+geography+of+africa+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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 10812 bytes
SHA-256: 7ce742529b85553a1af1b3d2aead0538ad88890e100eb605f624e9be82d558cc
font_02_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 18060 bytes
SHA-256: 67c39b6abc07929ae4e197ecbb25c2e64b222601f68d9c7baf0089cec2890c7c

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