Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b45d875ab8c6c0…

MALICIOUS

PDF

122.0 KB Created: 2021-07-05 10:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7b99b4455bee0b3ca4acd0d04b9de285 SHA-1: 9fc7129da320bab3a9e4cd492ac2c31cd57c2477 SHA-256: 37b45d875ab8c6c0285b55ae36d09b4c83f5c2a60dfaa629008f97574c4b7cef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rehcogglvcqkmspt4qr74b6vkc/3194203105.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8e1a3f34b00174f7c52f4996b8da9758/87192505429.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/volume.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/99c4fa25367f2dcf01a2d6e2c9b795e2/61029000359.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/41302dc71832af96cd0c5898bdbb2a26/90530082516.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/juwokoruxakebowokanogi.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/3167122445.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/254e76e5efe244a7119bf444173aa2ab/rozipiboxiwavurukizi.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/78625648494.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69840773e---29271912615.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4j9veht8uiucqvffidfns3cl4u/nekijuradudalaxuki.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/39162467838.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b1353a550c231cb5ceb6e77c997b2db3/romokaropatadojosu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/83678048217.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608152dde798e---8149132875.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082df41f0353---wofumaloravudov.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9981b6859---48864586650.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ee0d2d2fb04d60354047743c20759cca/60610231170.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/6794616853.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d1ee2115---piruzabofu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9572d8fe7---gijugubavusud.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/93205530642.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/84122882061.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/81985681328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ever+in+malayPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB7 19020 bytes
SHA-256: ebf9cbb8d846e7f5284d28ee25f0eb119c7363138166f5a8e71033be4364ef21
font_01_sfnt_off00018039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18039 19004 bytes
SHA-256: 5c17a57911090f7afce907aaaba3b0c1b461d8566cb7e08ed0ae9269ac829a8d
font_02_sfnt_off00019e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E6C 3064 bytes
SHA-256: d131a34d933b25eb3ec8aca7e7840a8415c4c3a39c76ad378aa97242e89bbf56
font_03_sfnt_off0001aa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C29A 10048 bytes
SHA-256: 0926eb81f81317a117fafca6785f76b1dc50a6454921f5aaed9a343b4d5cb6ec