Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c534cb1d320faf…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 10:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e59e7e245741ef7c5ae0aecb1b0a0092 SHA-1: d74d967bd2f78baf85a9ed74dbcd40d7743f80cd SHA-256: e2c534cb1d320faf908a9eb1496754141ee722819c35e4e2a9fae0c1e25586df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports the conclusion that this PDF acts as a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=glandula+de+bartholin+inflamada+pdf PDF link annotation
    • http://andlupa.com/userfiles/file/winigotav.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/37953643385.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/38739713249.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608223d457040---65644541197.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/38694289118.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc26715af---medebegamapabegiruzigubel.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/tenadalifarapo.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q0uppd5f7ordbjoq6lg2cc9v0d/23464383593.pdfIn PDF document text
    • http://fittbikese.hu/files/file/rekivip.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/91417721437.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f0940fe034c884eeb30e6d0873a837e9/84738381894.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutak.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3d36cb186afe2911af07c03ca109d6ae/tutenadewoputaloradop.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/39767175945.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/50f8bff00ae7a6d3cbe5574ebc6d5dc1/94701356890.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/20101747105.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/53271637846.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/jinapijelinoseralogaw.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/gaxup.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/paxoxefudabinu.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/17287185967.pdfIn PDF document text
    • https://ivaco.it/file/1761630989.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/gotasozimizu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91227974ba---xepadukozedaji.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 18068 bytes
SHA-256: 42f7d965f6fc79cab0e3e3ee5c961640e836be256e6e27233e175c81e67855c1
font_01_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 10876 bytes
SHA-256: 3af920d22da9bf69b5996dafa92eb6826c90ac8b26e30c412ab381f55aa4d36f
font_02_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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