Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89e2501271c7b63…

MALICIOUS

PDF

82.4 KB Created: 2021-08-11 23:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c84cd5e5a3ee59aecb3c5d05c7f49507 SHA-1: 56ed57d2087ccad29fe53131d06a54016b5b60f2 SHA-256: c89e2501271c7b63d42585a7e659c4d92e4573322756cebffd6ce62f313d2371
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=mecanica+vectorial+para+ingenieros+9+edicion+pdf+gratis PDF link annotation
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t78rvk7ca3pstgsdhfip3tikk3/20813769799.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d445b88f---22859370504.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f1f3ef8f2881d18331ad660930926769/fenavud.pdfIn PDF document text
    • http://tai-group.com/upload/files/32790815007.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/90917880754.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/29bdf39db8c2fa40a587d96d15aad8d6/73786653992.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/81802645789.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xubowifuma.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rnteuq268m8969h3gpjm4t5cbh/48788653719.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/74301587485.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608033bd05728---17790387383.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b4a0714680a5561a662f0b0365c6990/55080387166.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0874756c5---25736841040.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2e364d7eec345fab57fb587bc77c8254/96956001905.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989d648c16.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea40061834---27113054650.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/50802808769.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6ead5725aec1cdcbc80e4893c7f6d084/fazipogowatevijovinesi.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/81487152198.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f6361507e4990c4b577130981c2d4c8c/ririg.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/nqk6k5q848vdgdvj1tkbggpqkq/1245029747.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/tifejapixusofikube.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/pidap.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_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 11020 bytes
SHA-256: cc66156dfd8500bd2182fbd7093995e6d64403b48bd621277a5bc316f8450591
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 17624 bytes
SHA-256: 297aeb0d66565a528a10c66ab5c1d14af756681f6e71fc9c7230ff3f10dc846d
font_02_sfnt_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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