Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d63fa804a67ae1…

MALICIOUS

PDF

123.1 KB Created: 2021-08-14 21:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79234a877e4a62bd2bf2134e33912dad SHA-1: 7ebc83aa614274e49e4bff725232a8575439d34f SHA-256: e4d63fa804a67ae188edcaa41d889fa71ad820685ad1435617b92c765e8c2c05
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • 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.
  • 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://krevue.cz/UserFiles/File/40489288868.pdf In PDF document text
    • http://deasreunion.com/clients/860224/File/bunomunujozamukukipenin.pdfIn PDF document text
    • http://philboyd.com/gexigufimamosevoj.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/48b284211a87a436d4a8423008844058/98714375311.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/difojodejobaj.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c10733befcd---tijezezeg.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/pugozavosisis.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c51aa7dace3d7c9cc8056f1434fe2089/bakijular.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8aq07tklsmudevq4cvhk1am856/20889006753.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/69629998126.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8daf696856---67103957206.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cdcef60b0a5a2b49e5408cf1ab5291ed/suziposez.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/75914397089.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160706e7a8767d---gixab.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80dc4d458b---fedapejuwoba.pdfIn PDF document text
    • http://toonesk.com/upload/86029783918.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/7353443405.pdfIn PDF document text
    • http://emaaravm.net/upload/files/89252769825.pdfIn PDF document text
    • http://zzweien.com/d/files/tunogesuzeputuveniwoz.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/28824367290.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/89887137853.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9eb4f7c5df82f5b6aae9fb5ddd18d824/58123114050.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/widitikobu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b519d1a5db3---labebovirotexenawagusukan.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9df6c5136---67537405880.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nenezakewaximesajodofinab.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/89467847565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=exerc%C3%ADcios+resolvidos+de+hidrologia+aplicada+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_off00017845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17845 10908 bytes
SHA-256: cca20cfe0180969cfde0502887264a4089e284a92cc1d85910dbddfe0ee3f420
font_01_sfnt_off00019165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19165 20112 bytes
SHA-256: 0e0a150483e331205dd3e5823828051b778d06e133645f5b4cf89178d9e95945
font_02_sfnt_off0001c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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