Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a1ac1df5d7b815…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 03:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05f2b0dc78304570b8418c938505c464 SHA-1: b207c8bc9e5ab55350354d6e65a2c9cc056f15c7 SHA-256: 19a1ac1df5d7b815258b721539bf60bf17072b037653c8f6e004303f468bc62f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The heuristic firings indicate a link farm designed to trick users into downloading files, likely malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5456cada5---85232852583.pdf In PDF document text
    • http://ziconiavip.com/uploadfck/file/fatanuxutewefakudoj.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/44855774379.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613219d2e72fd---forutuj.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e931a9142d---40494177398.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/miwifagemorifitizoxuwut.pdfIn PDF document text
    • http://moristas.com/userfiles/files/24739199387.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/bijiko.pdfIn PDF document text
    • http://boxethai38.com/upload/file/47861830711.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xadumarimufuvapeminidikoj.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/3844880930.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wowanudoxurewawadumosul.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/10909035915.pdfIn PDF document text
    • http://reylab.com/userfiles/file/rasenezuweduseko.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/88709131376.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/xisafekakujigazimuwizoj.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/39094820000.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/93436952147.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/29170081729.pdfIn PDF document text
    • http://farashimirooz.com/files/96178604951.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/65520499679.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/90923366399.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nulorudibiduxit.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/jodidurubenagejupog.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/majixedenorulijopemat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=install+app+from+apk+filePDF link annotation
    • http://irodori.kir.jp/files/file/suzojosegalapalu.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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 17120 bytes
SHA-256: 283a9d40da4d327eb943a92054b4abe2621a7e35a0f77859ee16f6c111ac5909
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 10564 bytes
SHA-256: 37b9fdd4003a98eb3facda1ac48abbb8e5070daae1ac30dd43e98436fdde7f30

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