Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5826f3380892cda…

MALICIOUS

PDF

103.5 KB Created: 2021-07-30 13:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09590e21dbef4f5183f4416fb5e53e8b SHA-1: ed5212ec29a934b9e551098fccda579804d5c627 SHA-256: f5826f3380892cda86f5ce2b60688adef50478d5e88d2c40f163ef5eb271e5b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.vikingmaterials.com/img/fukexusowotapatun.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6452e8369---kilelanotaboxofavetupi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/jubirikiwubudo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45678d3ec---vewujeledagavusowasi.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mewurosumat.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1b2ab96fe65db6bcdb5e4f423c25f634/36644946037.pdfIn PDF document text
    • https://people11people.com/uploads/File/kufoxize.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/rutolubipunid.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/25181880876.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c0f798020489ed1d252fd2f5e43c2a2b/risimufopuvixiritosulaju.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/62334110599.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/2861397777.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/12924502012.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2e3e51a3bafb9f1ab84ed117c4d83246/1205742468.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f0dbb598---79587819761.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a90b58049ad827e9b5a1882160b7f5d0/15106309672.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b25ef07b---72218403478.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///76375215166.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/12937053738.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608f680f98c40---majovopamulebogetolobi.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/gukazubevekitivoborofufam.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/59020994329.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0a9f28b518be015d3cfd612bbb31d540/44914474954.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/17220469717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=obras+de+giovanni+boccaccio+resumenPDF 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_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 18352 bytes
SHA-256: 1190ea779c67551e5799ddc7814f90c5b37e51fae843f99a2949b65e0f722eb0
font_01_sfnt_off00015cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD1 10900 bytes
SHA-256: f3b3cca0d047090ec9f5b7d42c63a1c68dbd616d165ffcca933e4f479b91c566
font_02_sfnt_off000175dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1