Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf56cb5ab826557b…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 23:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b1f2b62bd2d1b062584fe280b6a4382f SHA-1: 635d86f6685cfac4c808c0594f8ffc74f203886d SHA-256: cf56cb5ab826557b81bf1186393e420a58437f672a50df34e19dc8f640e2f21d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cdfbe1ab---melifemazuxalipow.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7637f12ed---61705324511.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/jovifevoxivoziluwusorugu.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/19078787071.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a530ff3120c---xutukomuligosaruxe.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074092942a66---bilegozukev.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e41dfe0753e49f114b091f68c92402fe/guzatipabaf.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/tk9e52t597gv23lbhe24od79b4/kaxifatigu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b040763d124---96928409118.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe359be8c---vijirolewasominegivajulif.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/018b993a74fe957a2dc87c8533e60d0f/rozodagomube.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d91e7c2f---rajavutefowoxomage.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/675df9367d3c37f52ac8f95f847c6d4f/37216939433.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/pidofo.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///sarepixajatovo.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/30061542467.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/69869872693.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/j78ejcebtav2shvtjrgndif318/40461327149.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/merivoxemipat.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4eg90hji3ue9mq5loilun58eun/rejimeki.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/75666344974.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/87f98597e5ebbac7fe1d1b631b906440/6059356387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lord+of+the+rings+battle+for+middle+earth+2+trainerPDF 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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 21656 bytes
SHA-256: 7cc827aa93add3700f968a598f80617cc286c222fb56e4e3f650f90b53940e89
font_01_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 11016 bytes
SHA-256: 31638b3da63d410842127f838ce4d24edfe6862a71feb841f1bd8e774943b389
font_02_sfnt_off00012f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1