Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5e93f5bd5fe536…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 08:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16293b6b8b3a16eaa230bd6b5305fa44 SHA-1: 6aa18324f5f25ed56d34dce29f46969c7cc754c8 SHA-256: 3a5e93f5bd5fe5366740edb2156512bc36268faf66e187b4b792650320dd6360
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a high number of distinct hosts indicates a distribution mechanism for malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://dekoblickfang.de/userfiles/file/95141543162.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p3pssir11dameoot8ggia7pev3/40650327742.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/3262393364.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/99367494645.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/66418627375.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/89caa4a4545085bf5677a5a14d783dea/mirolipudazujel.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b180a491878---pizapidakivemom.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/97747963865.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/n64fnnogg6kgfme5406jetmp92/lokisixotilebad.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9321a5b01e505a0bb2b67693f2465891/99359342494.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e31914287c---rovidilemune.pdfIn PDF document text
    • https://sambelteri.com/contents//files/kewasunivuw.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/mewekabesorulag.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098791e1d0ec---sazovevezerolixo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/50203442810.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/zigeb.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210625234836.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/bepaxopibinoxigumaporowi.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/bc5dbee93b6bc85350a27ea6ccd0a62e/28547624739.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0cd053ed7efd3039615a8a2cc4198a74/vuzilizerolimepom.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/44857990132.pdfIn PDF document text
    • http://recviem.ru/img/upload/simadudisapuponabozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iso+9001+quality+standards+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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 17192 bytes
SHA-256: e67d1dbe540ebf7bd40aa60f0dd357791a9befa6a45e19e0d3abe6e523e9eb6a
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 11012 bytes
SHA-256: 95cc7163d9e013ae51b4eaaab973c138499651c848f4e4923285956ac96bf4fc
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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