Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f727f62986f0d6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 16:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2cbd522df549f09e60628bb1029a035 SHA-1: a282505b49e8e96303bc6cc7414fdd6192cd4bb6 SHA-256: 16f727f62986f0d60a7167e7455f48a91161f30da125615bfb278031c59a0c9e
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=android+studio+or+vscode+for+flutter PDF link annotation
    • http://smm-mm.com/uploads/news_file/55246052911.pdfIn PDF document text
    • http://thepducphat.com/upload/files/45347741270.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/99273446481.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/xewajipinili.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c65b3ff9e---50141764392.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/20cf3da99d292beeeda4d02d01fcb72f/xorelejexuvedowaduno.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/83601749888.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/folosidumajuteved.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4d2b21ec---rilasila.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/xesek.pdfIn PDF document text
    • http://traviet36.com/upload/files/welevepumesadesagudopivaz.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/fadubovogibis.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2a32ma1jgg90823bikpl13jlkg/53789668422.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/2501467463.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/ridemidafijumoro.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/31978971979.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/81950607664.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86ccbe2ec---55108067343.pdfIn PDF document text
    • https://hoongnau.com/upload/files/65111903568.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/85482284446.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/rilujuzobarawu.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/20684697620.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613368970438b---88227327233.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/gugerimumepenutopo.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210901130706_c0fiws.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 19452 bytes
SHA-256: eb1b7f3cf81e8e6ef2b05f3c143e2a48498465e60eab2153cd62bfe5ba3bf90f
font_01_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 10456 bytes
SHA-256: f22ad37e4577c02a07b5850ce70dc578153487675cddf88cf0b6f3d56688a261
font_02_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.