Malicious PDF — malware analysis report

Static analysis result for SHA-256 59056db4a35e616f…

MALICIOUS

PDF

119.3 KB Created: 2021-08-15 19:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ee43443545f91d93b657c8cd938c2e6 SHA-1: 6a5528fe9144c6c8a817977a4ee4efcfbb7ff213 SHA-256: 59056db4a35e616ff6a04e34f8135d074878f45feb0181d40f5d2a7c4d9e69f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, directing users to multiple external websites. Several of these links point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://airsoft1.ro/files/file/86389139781.pdf In PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/fajurapugi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb444f9062e---70407512189.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ed8ff3844eaca48b8d45fb0174f68bc2/purakevadulifimewiravowo.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zixibodasuxekilojetoba.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/43195795957.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/25905591112.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/jutufulusof.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c02f499dc---xogavop.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/33194645453.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p2cl0ch9p5k78b395rtqqsv0u4/janota.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/83197346811.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/deduzenatutupazifutog.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/96449104463.pdfIn PDF document text
    • http://asustainable.com/global/file/17142673734.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bba52839---69838817376.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb8136e43---wagarojimolojovidozak.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac290dd8b86---bukefexisogorazaz.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/12065308178.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fasobapiseluvajog.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/13723236513.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/raregatixidixuwujaziwuf.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dad52abc8---3628653941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=oedipus+sophocles+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_off00016c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C96 10380 bytes
SHA-256: bbfe8c1af4276e80ff510512401706a44efcfb14e9bb871d58081aee1b415c1e
font_01_sfnt_off00018424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C36 20072 bytes
SHA-256: ca610e7e27c4bb1bc24b9c6fcd12577536dc5aa124954eeb2fad04e30922d7ef