Malicious PDF — malware analysis report

Static analysis result for SHA-256 9852f99936ed27cb…

MALICIOUS

PDF

86.3 KB Created: 2021-07-24 14:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 177ab63a38f5fe533ec4307e08490954 SHA-1: f511467b0374271cd1242adcecd11fd99f6dff97 SHA-256: 9852f99936ed27cbd72c07e9d4228f7f52867bdbf1c3b13784be1839345f3093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, which in turn host further PDF files. This structure suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d43188c6---31971344084.pdf In PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b042e1446e---xexinamejobi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700616ec994---11586974409.pdfIn PDF document text
    • http://shosholoza.de/file/20690095720.pdfIn PDF document text
    • https://agermag.ro/mm/file/55904352333.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/puzilafogupewatofiku.pdfIn PDF document text
    • http://dothi.info/images/files/14006676082.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///60203189180.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/77787292765.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/57973576799.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1331a7df75a8ee36a2488f683e7dcb8c/gararuxe.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a17275bdf3f---3755918119.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160721aa794a30---23799390171.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/tunasenununumamikesan.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/kobumugenefalola.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/tuzatomevibis.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/bawikuwoge.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s6krtp9tc0dk7vv4tukhtfrjcf/35417430659.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607065127a863---sofovotogatomejegowifo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gsilacso1r78nfuujr7lsmhqf4/xulidanikobuwa.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/2411754478.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/47772730389.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/lorapevodujupokijojepi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e076b295---mitizetizab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tabla+de+radical+alquiloPDF 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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10344 bytes
SHA-256: 9ae026b1dccad219627b0bd5c9e68932760755838b7f79d6f3fa6318eb291f7f
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 18868 bytes
SHA-256: 4828e592891de1e16852123546ce88d6f39a78733023914aa2d3329bac0e53ac
font_02_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1