Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6518cdbd3c1060…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fa07e6993d7a03635aaa49932bbc1dd SHA-1: c952787c9acb2c3416e459295ea1b0681fbf4a2b SHA-256: dc6518cdbd3c1060b6f796773d4eae95f0d425bf14ef7c9b0fc215d8580b8e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pistant.ru/uplcv?utm_term=big+one+story+house+in+bloxburg PDF link annotation
    • http://www.dkmodels.net/ckfinder/userfiles/files/nuvujadopipazoroniloz.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/vawelosegatew.pdfIn PDF document text
    • https://granitnet.hu/editor_up/gepifupokimukinizu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/tetomipidevanegitulupi.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/99565314645.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/49670074002.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vujavisizujakunute.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/94539856517.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/33684159406.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b4607e3e2---47844346389.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210917_60CD3EFED5B4CAE0.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/fonebowexilarukesofi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/65349037023.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded8a94f78---bujuvininirafime.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb7224bee---jagobeganosopodobupowoxab.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vawumexitofawir.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/59841068063.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/xirizefosuxegus.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/taniku.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/25283819300.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/gejupisabarik.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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 10732 bytes
SHA-256: a21b78ecf2991ada779c1b221a03d427441ade28f2d539486a6e205495ef2525
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 18640 bytes
SHA-256: f98d817c63524b4098368b1d5fe981c93c5ef196fe4286ad78f34bdaa60d5fbc