Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7819d4c241a0ecd…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 21:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd6377ef3a6e7de91462598035f3e00f SHA-1: b85ff62ff7ec77fa3856c278d94a330fed7effcd SHA-256: e7819d4c241a0ecd42124aacf271f0caa2297317a68672fcd2f6851b40e7a2a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=ministers+of+haryana+2018+pdf PDF link annotation
    • http://sosnovgeo.ru/userfiles/file/905588677.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/lovobodonojinubepadezeris.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/jutoxatejurozolikopamo.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/wopep.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/doribeg.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/famobezo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4cfaaf2bc2a5587a7fb89239118376cf/dolesatozefikegop.pdfIn PDF document text
    • https://harom.ro/files/file/vinebojabuxidadumog.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c3f2127f---notemutiwodivo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607955d7ae6b0---gasiroronimibep.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/kulawafevezizeruwodumixu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d2e6ed7cd3ccc89a4d1e12ea11d1a06c/87208818442.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/88655643410.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99f615f2c---mubatexesozukisuluwejofo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c87de3e62e2---91246831758.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/17571529028.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4891364d8---wafukenatanawit.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/85970941809.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/58780033113.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/zebinasidozegulowepowus.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078acb2f1ab7---lofuzibutor.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b75b41c84ad69bb53928244af540dcae/detanapukunapawada.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781e5823d76---46941047891.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/keriribozurubigido.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/rozexefekagima.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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 18100 bytes
SHA-256: 6cd856fd8b230b7bbec5117a2b8e192cc3f3a9cbfb121bbf2fed58fb55595d7c
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 11160 bytes
SHA-256: a9f03d51f04f5fbb9fe1b603893e05ffad1a3b6bcda30b2232f26219cd13872a

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