Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f5b80ab325c89d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 10:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40c5e6ef3923c966800571378811d55b SHA-1: 5a7503e863417685bd40f19ac85d537d33c15a3f SHA-256: 09f5b80ab325c89d60dcd7a145074b637f24c730a11f3be0cf1993b22cdce13f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of embedded JavaScript and external URIs, particularly those hosted on compromised WordPress sites, suggests an attempt to deliver a malicious payload or redirect the user to a phishing site. The 'SE_CALLBACK_LURE' heuristic strongly indicates the document's intent to trick users into calling a fraudulent phone number for financial scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=remix+os+official+website PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9b80204279f4e9d496390ae4717100a4/xoxupejutezujufomini.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92474226752.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/76713442919.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b7f94fa2beea9eadd1347c76b0c77410/kokefoga.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/58620006308.pdfIn PDF document text
    • http://qwerty.pl/_data/file/65554932374.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/pamojo.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/28105718361.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/pejafowadujo.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/82749374974.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/ripulelob.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210911152710.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vazowugowigatut.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/51480839447.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xuzagozidogizok.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/50233870570.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/69611116026.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/nifal.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/79579915366.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16146d8451f72f---79226774207.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/48a50d6b38cc773ce372beedacae4e2c/degafobitajonujipasipiwuf.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562fe7bdef---31481542003.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/togigofisofovizakowilelut.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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 19384 bytes
SHA-256: 737993c136b2a0c429ed3622c053b67147daf942707d2231ae538b404e42eea3
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 10668 bytes
SHA-256: d7d1cf7988cbfcaea087ee80805c3b2dbd928800cec45309151cca0d6a1cc6e6

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