Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4cd5222386cdcf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 19:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f14185b9a88fe07262bf79aec4ca1016 SHA-1: 5785d6d5c5607948df29b8eec1e079009a6944f7 SHA-256: ba4cd5222386cdcf61e738976f832246c2c0e56defe0cf169758c200b24537bf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are designed to lure users into clicking through to external sites, likely to download further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26a68ac90---mipox.pdf In PDF document text
    • http://stjconsulting.it/userfiles/files/zefugogizupe.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/vuvajowebuz.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/vanife.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/jewajefafiwedukedobevekir.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/vidadomuxelumijob.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/45132259938.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/86496169479.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/64526418913.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89586cc5---nepopumuwesosib.pdfIn PDF document text
    • http://classtool.info/upload/files/rivam.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210909085133.pdfIn PDF document text
    • http://llux.vn/uploads/files/84377887872.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb6af4140---fokipe.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dabijevi.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/voles.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/musodasirojaxiweginufe.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/69336455707.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/86353868368.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jozojem.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/jepududateferaxakejigi.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/susolemivalo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613582cc682e0---tawunaxatudotamabezaburiz.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/nazosupirudekepudujus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ghost+adventures+horror+at+joe+exotic+zoo+123moviesPDF 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_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 17780 bytes
SHA-256: d649536a87f9884dc2ff25fa0af5c0f6ae3f864dd0c7e4f740923ebdd44dfcd4
font_01_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 11428 bytes
SHA-256: a8111cb5c69a819fdb0883f61d9b24fa4ffeb1cee7501ff851a8768da366aa47
font_02_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1