Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41a5dfcd2b8937e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 20:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b65c69f9986a229ec24772f1b24822c SHA-1: 879d5c5899a57cc42e86f3e5b676f674d129e63f SHA-256: a41a5dfcd2b8937e094b9cfee543de6c460acd2add99bdd889b6efe6c6254ea4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=setting+up+exchange+on+android PDF link annotation
    • https://worldcastlive.com/userfiles/file/78426198313.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/52859828942.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/68527917097.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/51080f37fe3ec48592e2ba98fb3aab5c/sexonivewotin.pdfIn PDF document text
    • https://ahha.az/userfiles/file/murugixawopolovenu.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/menivulemiladeno.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/11492303255.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7938a8e433b257fbaf480f5d4f2785d3/72653084531.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/mupafutaranuromawiv.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/bapafokujotepovifakigoni.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/24650841066.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d7517a62462ad353c700e36d7b6076b2/zuvomopeveduguvu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a056dcd02---nidewonak.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/9864362723.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/79851102407.pdfIn PDF document text
    • http://edeins.com/userfiles/file/32208816037.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/milosuwugajotazaroxatob.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a36487ce59---90412489877.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/xatutujerodej.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/30029478764.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/20011421107.pdfIn PDF document text
    • http://deforma.it/userfiles/files/weparasi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sag9u0se1r8t6nr28rlahtj1rf/71761682658.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10856 bytes
SHA-256: 20810d27a80c9feb57bec71e5ac234fca39b80ebfe575e8db1dc426bb7c19530
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 17672 bytes
SHA-256: 1e7e96e402d9fb05487ac8f8cb68123f64f70c4c74271386b37287c2c5bd2837

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