Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4c883be5f92f06…

MALICIOUS

PDF

104.8 KB Created: 2021-08-26 14:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6af0758f0d4973b165b8b4fff6472e06 SHA-1: 2ae4b829963d7386371956bee2785b7359e0b9ab SHA-256: ea4c883be5f92f06a64bcf5b2333a4f92c1ff2f67b19525aa24b73cbb0fe83cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The document body was unreadable, but the presence of numerous URLs pointing to compromised CMS uploads and disposable hosting suggests an attempt to redirect users to malicious sites. The primary attack pattern involves leveraging these links for malicious purposes, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed686b1c78e---67789963915.pdf In PDF document text
    • http://aimecostruzioni.it/userfiles/files/kamajerirumufapajat.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/osa597fbuj37ji1h0gphmuevcq/9939048764.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/58997487405.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160863987b86f9---zawafoxagalawitije.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/63688307986.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a895cb55dac---30914036876.pdfIn PDF document text
    • https://landbar.com/upload/files/72385507023.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cb989e86---81731627291.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/33519793143.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607744bd9525f---vinex.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837902da0c9---84538527584.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af569d2d39f---zavubiranotaj.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/novexufoxanopubamuwok.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7dacb0b2475d13f1430bedc28bf58e30.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd673613b---wivorarasitolawaxenivigo.pdfIn PDF document text
    • https://petala.gr/userfiles/file/rorotogofitan.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/adu8mjolvqbp1he88p6ubr4eq6/78726493291.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/14224243185.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a00e6304---jipifimav.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba952ac0c---25891190483.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160723b6050ac7---25862787077.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611d05b72139e---98348626545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=unix+viva+questions+and+answers+for+labPDF 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_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 17668 bytes
SHA-256: bcfbbd2038b50bae32580ee52b0815a247169c479704fc880e59557c5efd054d
font_01_sfnt_off000162d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF0 10996 bytes
SHA-256: 1d53060b2272aadb63fcce668dd8f4f53d544e064238fa41af1035cc702eccca

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