Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c08758bfec3410…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 05:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fa18e85f8b31d692d543f3ed1c74f6d SHA-1: 2d3d3f555d189400cd4a1a950cc99ce14ddfded5 SHA-256: 63c08758bfec34101bd2e5f49cadcba97e9c327b00f40b873874c4c515cdd621
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-based document designed to trick users into clicking embedded links, which are part of a link farm pointing to compromised CMS uploads. The presence of embedded URLs suggests an attempt to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8a7100208314a7e4501fc0bdd87776f7/42109355613.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qonpcn5jjddkeujnl6h95gamah/58142839911.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/31396827112.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/54447227136.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/vipemenojuxe.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/wupisupuwug.pdfIn PDF document text
    • https://waroproject.com/file/tiwoditumeluximon.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/dosabebiboxuxomubegujabob.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/fd4255c2e370fc48786210f8f43d78f2/64541323413.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/d4db166de347e9ee7cc74854999e34cc/xekofupipofemu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/danak.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kotelaboguwa.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/boxejegaj.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/966f72b41b282677b31597042384cfe6/zomawuwolide.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/dopakagafo.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/250903393805.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6652f4425d---kibunubaw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7b105cc3---54052952446.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/88752164157.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/23805117416.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/begotewawu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/48382566fd91f3f2ef59df5dab9a5118/gapezane.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/82989792844.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/lafefowitezewuzawalalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=of+mice+and+men+essay+questions+and+answersPDF 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_off0000b797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB797 11060 bytes
SHA-256: c44682d1a2927fe3f62367f419fa41ce8ce3572ec7ae3b242f2f5a86f5979160
font_01_sfnt_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 13916 bytes
SHA-256: edfe5746884215b48dd9ca40bf19d40496474578a5b7b3663e1ddf69d8f4d5f8
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1