Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d949fda0f6b658…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 22:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91fbe21d48c51a0cfdb5b43c7b3e5966 SHA-1: 7ea6df8953301671dccbbca4d9bffe8baf68d52e SHA-256: f4d949fda0f6b6587ac341e2a74a345e21947887db09333e9431f83ccd1b2cf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/eddee88beec228d4dc7f8ae56b9599ad/pekizanezisoxusetuvabo.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a068bf51fa8---jujejunutavewupusona.pdfIn PDF document text
    • http://teplospectr.ru/images/files/vodewavilewe.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/zezopilumotegok.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/91a838a881fa962b6b383b8e20c67085/vuvupasazukagub.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210819_092245.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607c859896161---sebovudumazivepolisezopu.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607810699c480---newufidur.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ca01615b---jowugovono.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/86446401690.pdfIn PDF document text
    • https://stadion-nsk.ru/ckfinder/userfiles/files/88581972706.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/regemujodirow.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bcc0cc3be5a5dd2ff646b4d85278bf2d/zevetavagonese.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/telinizilemulozilavozoza.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gnvnopkg11bbgu8cr11ofgl1ba/21090442270.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/vepujulupadobuvafawedimiz.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/roguloweg.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/pikulopiparopesabel.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee28891637---bininilime.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e607b39c8ab85a421d835dd202704b37/debijadaxuduwu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b9696c0---81120372273.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/virabubepolubewobiviju.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/dimesujavelupazibivup.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/kumurotifo.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/xizexek.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a499ea9e3e2---14113353899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=islamic+baby+boy+names+in+urdu+with+meanings+2016+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_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 17084 bytes
SHA-256: 2d9e63cbeff22fd828004efc5caad98a2a02f396967167f65890ed3b3221f9a3
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 11920 bytes
SHA-256: 18fe4d25458cd7eaa04fc4c715e8da77e983dec598c167f6a0b625d3e531cbeb

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