Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c75b5032f2f9e3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-27 11:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d61790e4b88309ad7876f76ef36af7d SHA-1: 28521ca5d56bad4a279a892d17e116c0d4479540 SHA-256: f7c75b5032f2f9e35e01bea62ff4fb6d587225912f98c2b598d098615ec398e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to manipulate search engine results or lead users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aaykpn.com/uploads/editor/files/naxamufigikag.pdf In PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/18113416023.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/viginidox.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/63493923423.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210902112642.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4334c499eac6979a572252b6dda54961/fajalugajafiforeliwor.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/88874026456.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/sudimejekita.pdfIn PDF document text
    • https://kimcert.org/E/file/tupinadugiripugeduvadoz.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/55265107050.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/bofipovulujurekemujumuzi.pdfIn PDF document text
    • https://istanajp2.com/contents/files/36097117923.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/k1o2n3lc1imuq5uhulse9laa74/18504568381.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/54277559902.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/sirenawepekuv.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b515f23027---xizijavupodutiwerewe.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/fetebigezolile.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t8ljveukttbbodoctfse07r8j5/58815896356.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161442714a42c4---11686205867.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/vizukerevegilaraw.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/fuvegajazude.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/poparopoxumotunugun.pdfIn PDF document text
    • http://domosplast.hu/files/file/14819276330.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/90316358701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=where+to+find+screen+time+on+androidPDF 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_off0000c0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 10688 bytes
SHA-256: 8abb0d8900984e4c844e23564dc4aa1c7eec9138b0ba27e9ebb12086f9cfd50e
font_02_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 18408 bytes
SHA-256: 7b329f34814d88a2fd63b60c5b87a4ad6d5c0d56131b49a2a6f3e0b24d49fd4c