Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d52b9892577941…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 10:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64211eb437b196fd9cc0d564f9787306 SHA-1: 297a23242adc80d7a0f5c5d9167cd402aa0e863a SHA-256: a7d52b9892577941a28af0ae82ad621fc58207da388b15e298407436802fd1ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukilorifokefabajexepi.pdf In PDF document text
    • http://nattukoottam.com/userfiles/file/80478820941.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/41238239890.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614da136300d9---76564471570.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/87116294282.pdfIn PDF document text
    • http://kco.su/userfiles/file/43141783883.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/28074198198.pdfIn PDF document text
    • http://tavio.su/files/file/85786596956.pdfIn PDF document text
    • http://landpas.pl/upload/file/53031368097.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/13017894224.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/19907658835.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/80779902462.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/3608097731.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/67930714555.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/pewodiripelekojigaxo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613066ebb494f---74274523351.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135819b6e786---63643835752.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fojun.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d35b58fc5---40385828374.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/soxajideduxonoxenujizer.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/65791001461.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16321823707322.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/740635494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+dynamic+wallpaperPDF 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_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 14720 bytes
SHA-256: 18c67c5db7ff39e6435dd70229fa0c0d36d013120087315bfa843c57713701ff
font_01_sfnt_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 10592 bytes
SHA-256: c4d29597d3e345c36e9baa4a9c8209aebaa76f19315bcc1f5286afb0bab29657
font_02_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1