Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f29e511e6e5ad18…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 06:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3edca0331b255f89f39558da463c2277 SHA-1: 822e51bcd283bc6a37286282c223fe8ee7a73d4d SHA-256: 9f29e511e6e5ad18df621735ca1588ae3ec02205f1bb83df670acc7e6a889cc9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed for SEO manipulation or to host malicious content. The 'Fake CAPTCHA' heuristic strongly suggests the document's intent is to deceive the user into performing an action, such as clicking a link or executing a downloaded file, to bypass a verification step. While no scripts were directly extracted, the presence of external links and the fake CAPTCHA indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://irlanc.ru/uplcv?utm_term=www+ets2+apk+top PDF link annotation
    • http://ajivikafinance.com/userfiles/file/meresifawa.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/39953767295.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369ab6b3bf8---wudasubagosatamizelijomo.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/povixegevisefejona.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/80376581964.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/67924738033.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/fivavepavegi.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/36688961388.pdfIn PDF document text
    • http://happy-land.hu/editor_up/2774423369.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/luresid.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zagunalemobelajofebejina.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/49264918758.pdfIn PDF document text
    • http://netflor.pl/upload/File/rosunoparowimeg.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/12335786790.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/gejakinilaxalipane.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7ca3pjtcvoqchkq19n9l8p84jt/96900770298.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/totetudeb.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pomaminafu.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gurabanulorimisebo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613446246aa3a---lalufidekiditatedilo.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/rerozigoranuzodejulif.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/vexixawe.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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 17312 bytes
SHA-256: e6021078750176345119f45b54cd763c47a298efcb95c910343cd63e95e72a21
font_01_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 10196 bytes
SHA-256: 6498cd5d22707740cab87d524fb718046d3d2d2dbd6062fe0052e35b7b176d10

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