Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfee07fae60ff83d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 03:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0f06f12e08221656a7c6d2ba597170f SHA-1: 7b3b78d70b8a6116e5daa4f9b5acbfe954a7304e SHA-256: dfee07fae60ff83d269c87ab81cd437c86d82ba94749d3c6c9e82c638380eb56
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. This suggests the document is designed to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f79d4ce00---7293728686.pdf In PDF document text
    • http://tcsm62.org/uploads/news/file/44839504356.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ssb461vrb8em0lg2lp06pgct6/69195255624.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tagewiweb.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/duzorone.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/87134738578.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/43764298413.pdfIn PDF document text
    • http://fitviewer.de/files/file/92512295089.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/87712084202.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/kexexen.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/motitoluwalifov.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/xifivulekidujuji.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/fononina.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137764fc3315---97236276628.pdfIn PDF document text
    • http://cpviettin.com/upload/files/vutazitisubimake.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/87549518129.pdfIn PDF document text
    • http://devison-matras.com/upload/file/zoxizosuravaxevumofe.pdfIn PDF document text
    • http://k1a.ru/images/files/file/73062104238.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210904162725.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/251c878d4b0cfc800e54f03a2b49e687.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/5919732455.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/5970598890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vpn+for+android+4.3PDF 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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 10332 bytes
SHA-256: 7255ce7302851feca138f6bd1268501ba7123d8624ae1f5772c09566c8449f0f
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 16604 bytes
SHA-256: a78eac20baf6edeb6118bce313540065433b9b75bea5dc824c83c7195072e29a
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1