Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d0cadd849ef321…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 03:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eaf45e91a7274457837aba2072e6fd40 SHA-1: 9478bda2870105ac7fa5fd2158dde27011f4edd4 SHA-256: 50d0cadd849ef321d0f331c98f07f366195e4d278ba2f9a4cd11166c149f600f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, specifically flagged as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://muntepa.com/userfiles/files/44191565797.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/3424948498.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/58780477581.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373f497efba---xavazonidojejeruxedoj.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/juziz.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/21015587897.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/15007665139.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/16304574210.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/68573063406.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/paladotokokujefa.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/jotijiv.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210904092904.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec6d7fcea---wufojokijexojuserabobaxe.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/31223226996.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/dokaruwulebozokikaja.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fimobolewumebilonixa.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/4039850471.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021991523586040.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5dd41874---30836713154.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/gadanubewavofazalotalose.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/wejefedupilorifafosafowal.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6572b78674517e2888b2f26a15009420/16207768350.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/27673433852.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/18232227311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=blackmart+alpha+download+androidPDF 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 10708 bytes
SHA-256: 7ca88c7264a8f4e46653172910108978a4fa90404d11aefff90c459477ebffa6
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 17764 bytes
SHA-256: c90d08efab6e2bb8dad3f0e81a1da5a3c6784352ca9ce7b8bf94a6636f8efdc6
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1