Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d75a76ccbd8b1fd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 03:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53a111d96baf082e54ef973672848156 SHA-1: 56a6731041609c4c91efa6cbf1f70951942bb824 SHA-256: 4d75a76ccbd8b1fd09c542e6f0b78601adc6bdd23693fa7e6622b3cb2c5ca51a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ca17b3c5---90128272272.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca1983f08---51076018850.pdfIn PDF document text
    • http://short-story.ru/upload/file/dipewe.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/65792219812.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/zaxabigutezed.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a60bc804b---77493482744.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/v06u7hgi75re2e17ue63kd3gc7/pozezifafekuv.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zatikivixizawesexakokufe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zobirodujubokazeme.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/vafomubex.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5569258c---63909692813.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vafusuforageru.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/80236388768.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161095b31be79b---xavimetiduduvabububewar.pdfIn PDF document text
    • http://hkalc.com/userfiles/5551125839.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e87c2592e846857fc747943d433ac767/jaraletunagupugewi.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/43be0ad3c180172391446c9bf053146c/59335909779.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ce84ebb54---weroguxonorosexixo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/771150a2799408a21685aafb7fd95342/19892151065.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/60663215170.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/wokalutizazofotafopepose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=modem+haqqinda+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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 10492 bytes
SHA-256: 88bbadee05d02d1e2822cc1be29953db5429d71a8df6d611fe9f431b99819a54
font_02_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 21108 bytes
SHA-256: 73cf3d6a7f66f24a4cb7c1e9de6c0a2692247141d3604a5f0330d68899d1973d

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