Malicious PDF — malware analysis report

Static analysis result for SHA-256 503a5adbcc14c58d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 16:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cfd34fa00c4301ab75a30c5bd2a2c95 SHA-1: d23f77188c8e03b89b30553731432b2c6f4ee895 SHA-256: 503a5adbcc14c58d34ee33ec59e24745bec4402686253784e0f039b3dbde2c17
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, contributing to the overall attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0cc1583b2---2220835836.pdf In PDF document text
    • http://gramercygrand.ru/files/file/38629773499.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/kakedivozonobulinakawez.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/zofonuwijajomedulumiv.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/mapupogirifutep.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/76503033193.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780deb99b98---26440951922.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/vajotovonijas.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/45507778177.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/todesobawawogemegonoran.pdfIn PDF document text
    • https://service-panev.com/userfiles/dewuzewevuravixonud.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d245ca07ee3e406a6620f79799da2b3d/67795156198.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/zidajilefavox.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/84895341790.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e4d1287f---pibaresasaruno.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609122793a31c---47793254571.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48608a8021---vulamorudubakazulutif.pdfIn PDF document text
    • https://pellevah.com/upload/files/wenajur.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2723edbaf4e461290901f7656eca0054/6714498761.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/87803630293.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/13881380721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=alerta+amber+mexico+pdfPDF 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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 19000 bytes
SHA-256: 7e39b7e4a48bed18e8b0daa70abe316afce7609e59ae7e0bba801df86bddb08b
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 10732 bytes
SHA-256: 0c6ab897f47e9f65ce72aa6f180719af3b2d33f29c7c38a13e7aec4e2d0bb23b

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