Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffb5737477fb901…

MALICIOUS

PDF

90.4 KB Created: 2021-07-06 13:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68b3205ad73f76c98ad2c3841cdd4915 SHA-1: 09939c81efe46c0fd1107d0c7e747397bb61cb9e SHA-256: 5ffb5737477fb90120667f0d283b7fc59e6fcfa75ca2c422406eb0aa6ac74ecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm designed to redirect users to various compromised websites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://aisef.org/uploads/userfiles/file/file/zujajodibukaj.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab49eada31---guwaku.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061101151173499.pdf
    • http://bomtvcloud.com/data/board/file/20210513190852.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210510050727.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/vesisasedemofulupofuve.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/sobexigalubepadumirir.pdf
    • https://kodcomputers.ro/2664/uploads/84496402029.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3e6r6mo4ood0n7nhckldmiad5n/navujupaxiniwi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a64cb0bf6---nozurumovofasadob.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ujnb18crbjh59o4bmc6teo3rmr/paxamadegofedefudosama.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j1pam80ed48r4el2n5r0oo8pki/61234518913.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/dovedulijekexuj.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5a145dab---zebajezakes.pdf
    • http://kawoka.com/userfiles/file/63173874796.pdf
    • https://nutricount.cz/UserFiles/File/wovawedasepizosirurasina.pdf
    • http://myjobcareer.net/userfiles/file/2021062400051973499.pdf
    • https://mollis.rs//files/26480213927.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86cb79910---tozukupoxixizuxugeku.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070222bb1eea---muvolopotezebotawofotakij.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/pezokegav.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1d295d95---89960143323.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22be2939c---lubujapaxenazovaf.pdf
    • http://lubrifianti-auto.ro/files/file/52703646109.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf798aa18---11497712938.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fake+blood+cancer+report+with+name
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe6f.bin
27187b97264d11bb270cab39866a2ac230545dd9e786374d7f61a398dc8517b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 10904 bytes
font_01_sfnt_off00011740.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16792 bytes
font_02_sfnt_off00012f52.bin
77469529ec234e287922f00a967decb7d6cd38e23c0de2c272d420ff5533f6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 16728 bytes