Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef65e18050dbe66…

MALICIOUS

PDF

89.6 KB Created: 2021-07-25 12:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ababb120cd3db620e9dab694abcd645 SHA-1: 5fff9b9adb0672f41a374d6cfb0977259d957f2c SHA-256: 6ef65e18050dbe66477ccf116b49f66066b3745e0135b819e3e57c1248924bfb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ddroc5vo4fe1uocetqr8jstf8k/73747457281.pdf In PDF document text
    • https://legouic-peinture.fr/userfiles/file/54014393506.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/h1ndbobrqd10eia1e7n0d31687/26153357987.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q2ho68uabihtik03lfb2dra8a0/nitoxirotaxolu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850e6693390---48883866646.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/pazafepe.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094009c8a37c---pezuriworipiviwipalu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45b5f8cf08---2908390417.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/xubarolesejixubeg.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/36cb8f1fdef2437daa593a5e68da44c7/karuwemuruxe.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/67821270653.pdfIn PDF document text
    • https://isosklo.cz/uploads/gezozoxiduma.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xovuximaluvabejimuneput.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc00a9205---75816899889.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pii5b8p5n36ra6oo0cl8939619/fijebekumuv.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/nujubulidetixoki.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vovage.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/jafukawuja.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c869656b1---mosegesagenivitisobemufun.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9jfiirk9jsgq34m9d3quosevp5/fekidopowulexitu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1eeiafr9j22bm3d657e69474u1/zuworejuvikufinoza.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bd21a0ea---weporofikojozi.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/wasodubasotukaruvenegite.pdfIn PDF document text
    • http://jngf.cn/files/file/71552678218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+clean+ultrean+air+fryerPDF 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_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 17304 bytes
SHA-256: dbe9e71f025c98b313738ac6899cfb309d737896def751ceedb2566d0c295fb5
font_01_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 10452 bytes
SHA-256: 0c3aedabf50e0ea311f0ba907677caf63c314e6228f187e58123b88376532b32
font_02_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1