Malicious PDF — malware analysis report

Static analysis result for SHA-256 a428047bc55c0ca3…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 23:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af533f39fdd0b493e53e454b16e2038c SHA-1: 62ac6ad30f9ef7523bc65bc86528cab6b9d40e01 SHA-256: a428047bc55c0ca3c1cc75ae5a2e094f8c2911e95f28376dbc308bdfc83e558f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains, which is a common tactic for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://reclameindex.nl/images/uploads/forokitumimivida.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/relalunit.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/535ab139f49c9f5159485452881c6419/wulutotogapexowi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d08bc09ecd77edd53eb3e711a95deb11/nevoxesurenelumowalef.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/botiwamiserogabokoxe.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/fitefinufomabugamulalilub.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210618184759.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/csh2eglp51isdlqrgo4mmj4l92/38201741517.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c991a220---70401548783.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/gixedi.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/3130709218.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f1ccd0a3afd3232a326c97378379e8b8/87940449052.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/51854310641.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6fu6919nahdv8vmho6slltpdu1/rorizugizetaji.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed36a20e6---25444631227.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e1d4ab6c---11622158980.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/fiwasajejawebolaxi.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/79328950099.pdfIn PDF document text
    • http://pneusmarene.it/images/file/8258514744.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/dokipomiluvinimenujek.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae279f7f4---sogifesewegudapofali.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099c247a58f1---lijatizavipewema.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/xapofagakifeguj.pdfIn PDF document text
    • https://ivanamihic.com//files/67049784525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=calculo+de+insulina+nph+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_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10652 bytes
SHA-256: 3d82f1b12de36568bfbc2ea2a315abf5ce1ee7227de4a891cdc968e555be4c92
font_01_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 20288 bytes
SHA-256: 1dbc416a9dd7ed99f2bf3c27314ec838c05b1392526998e5740707474ce790be

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