Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbdca4e9aa3e8a5…

MALICIOUS

PDF

98.2 KB Created: 2021-08-01 15:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50ac028453b0bf1cfae92daf22cf3475 SHA-1: bb922bb51378f63a5627529720542638768f62ac SHA-256: ecbdca4e9aa3e8a5f7a27e522406edfb76e8bbbc331363eaf21d0fd2051dad48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs to execute code. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://archism.ru/uplcv?utm_term=checklist+beanie+babies+value+list+with+pictures+2017 PDF link annotation
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/70030491792.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/06a7130ade3b5c6cc97c26120d23b129/golozaz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815fe068b6---xefewobo.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/21849561424.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///jamugu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wilinupevujoregiwe.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/44539307025.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bibadivo.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea15821e7f---13079469579.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qr89hfd8utl59u0nq0bsr6tndi/nirunezositigonerogut.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/iqfefl4psa0it602lecj3d99s6/25937493934.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xovisizegebit.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/36565111264.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6d92e0bcfb2f4afef00ffa480e734b2/juxazibose.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/bf4034c883a6f1e19c338614c56a90b5/12780882613.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160769dd0eba27---3206707776.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/22260364292.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/ketedinezuzenabokutej.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/rewirewapedonibosigu.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/82592670403.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jbh7lp90rn00p87cnocbmhqjsg/86076844247.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/9986842893.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_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 11208 bytes
SHA-256: dd44a33d01ed084f87856345ffd92555a6d1c013fd27b9b2f778aad2d754f5c4
font_01_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 17308 bytes
SHA-256: 05e2e4cc8b6bfd5cd76bdbd7ec8413fdde7736c99360bec4e0e14ff0271cc52d
font_02_sfnt_off00016280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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