Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea15079e96ec961…

MALICIOUS

PDF

96.5 KB Created: 2021-09-18 15:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00e0117869481fceb6efd48099a50d8f SHA-1: 3d0f6f812f0fded84f616d07909541063ea638b8 SHA-256: aea15079e96ec9611895fb6fcca4a5dbd33e68db43a1254b3ae85d7625134845
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically targeting financial information. Heuristics indicate it's a payment redirection lure, describing new or changed bank instructions. Numerous URLs are present, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to host malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the ML classifier strongly suggests malicious intent, likely involving exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://nomylo.ru/uplcv?utm_term=layers+tcp+ip+model PDF link annotation
    • https://hazeloyun.com/calisma2/files/uploads/71184075052.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/tadaduzebuwowamabebixurol.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/lisevedu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/86042141175.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210918101641_0osdpf.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/rirefunozujokukojugomaluw.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/seriloxilotebinot.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210913141326.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du0ec1avps92fe9dcdkffr50om/12239177131.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/xigulevufewulupobuf.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f954868a78---88017582546.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/87441410132.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/86632159994.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/37230545751.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a4c3a09d---berezijorabuxezijipu.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/96894711249.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/41411433314.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/69985653530.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/97242159976.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/862383433.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/80001098670.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/20232842932.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916045325291.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_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 10644 bytes
SHA-256: f0c736d2a05168ca1af1fd47081bf0da8426775e3936f1cd1ab6797f9251d5de
font_02_sfnt_off00014504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 18116 bytes
SHA-256: 0cc1f075ad2b281d26c3784c4a9d25c28eb2ca5da62d309db04eb4342d304c6e

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