Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5d04204503aa92…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 00:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6b963d4f28a4709df83a0a8ad4d167d SHA-1: 9dd2005024e94ff65aa25ff7ac2f13fdf81bdbfc SHA-256: 0a5d04204503aa921a319e3fab744ea32e80754ef3c114590e691ca4dad000af
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially compromised or disposable hosting domains. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to download further malicious content. The embedded JavaScript likely facilitates the execution of this redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jl-vacuum.com/upload/files/lidimapugunagiresezele.pdf In PDF document text
    • http://tbeaindia.com/userfiles/file/65003760465.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/50505509873.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/paretavaxiwiguwezosaza.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/matudufipategufadugudu.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/25002753377.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/20317455039.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kenisusinij.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/68153843813.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85548052235.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/jumikaxerufavokatebo.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/53099648387.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b28d38b5---57257022418.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136296d66ad5---30657779893.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/pufizokutedozig.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/niputoronazo.pdfIn PDF document text
    • http://qdjshg.com/files/file/88024486409.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/bikipi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/vawadapipasofuruvev.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a5a632fc---54051667928.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/wapavewodakudimixe.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/wezajirarafobo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3e8a52e1---16838144185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minitool+android+data+recoveryPDF 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_off0000c0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 17212 bytes
SHA-256: 9343abeba0b1b00905448707a5e71c16adef138f3179480472e5019091f675c8
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 10368 bytes
SHA-256: 5180bf6b1e4ea7961d2e3bc0d5ba95d66a36697bb6f287735ee64619f53861aa

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