Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdde61637fec7a2b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 22:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ea0fe7129c12fb383aa3982985adbdc SHA-1: 5960e2762a126d523ee6904f3d0217da1fd3c981 SHA-256: fdde61637fec7a2bbafc2f435ad93aa042daff5d565ba878703fe05f930c69cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=the+irishman+full+movie+online PDF link annotation
    • https://globalathena.com/ckfinder/userfiles/files/95608527112.pdfIn PDF document text
    • http://yejida.com/userfiles/file/73456639898.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/kowuveredadibesi.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/futozebef.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/voroliwulufovevubex.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/kamoraxutadubegutixebonel.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/37996754416.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/batebototofivuxavilumuzu.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/polikuvululoganal.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05f422fff---pewipogosovat.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36990057743.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/45969552917.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146371548170---jerije.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/5613614292.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/pesoferegujesawef.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/14557405736.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/82954492515.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/fagutoturiterelinekupapo.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zewog.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/kuwalujirumezune.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/54677136667.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/jafedajali.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/23084537790.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2faec86e1---rokitokekafimaxuw.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/57274534106.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_off0000c23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 10512 bytes
SHA-256: b64939cc1885a840c3e173dcffca399e800fe028c55bd0761ce6902bc6fdbed8
font_01_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 18416 bytes
SHA-256: 2a3c1241410bd9907a2c6a7936f9ad824989bb03a829f3c196cf2a00e2b2b763
font_02_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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