Malicious PDF — malware analysis report

Static analysis result for SHA-256 2189950a6e3c2127…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 06:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 581b94edf043e2882a62e4a4f05fc1d6 SHA-1: 58f5d8af400cafe47967ae552471d8fbcb4354b3 SHA-256: 2189950a6e3c2127764cd1c910beac5df8b6854525236cf6a251d62564a12a13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to delivering a malicious payload or redirecting to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=light+photo+editor+apk PDF link annotation
    • http://talesma.com/E/file/86089928446.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/64341186722.pdfIn PDF document text
    • http://tchid.net/userfiles/file/60553360666.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141224237321---kopakufijatesolivuga.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210907011328.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/buvurogizogujabemukelep.pdfIn PDF document text
    • https://westech.solar-napkollektor.hu/js/ckfinder/userfiles/files/13434666770.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/51278906.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615121ed6dea1---60709856133.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/9684570268.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/k9saa5u27gli6u6jeanl1tj5eh/muromuletakogejaxitu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130998b01514---fagetejebobefuf.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109252244004363.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/29074984765.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/34058855083.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137539b7a4cb---3353718564.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/vetebaxasoguvewokoradol.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/zipamuvaraz.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/pubukuwazofamufarixanejo.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/49302799454.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615057a1ea3ec---doguloramikotenaxudotudaf.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_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 17184 bytes
SHA-256: abd745c73537082733100931b6e72eab171d7db0edde2777071aef359e9f91cb
font_01_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 10404 bytes
SHA-256: bbe2f0b44f10f2169845901f5cfe47805e7d6311a4244f021a22a6333df0cd16
font_02_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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