Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b0bfb3d1ad6f0b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 08:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af0821dcb26b24f3083fcfcd1c30d58d SHA-1: caaa3e76709fbdbb18ebb57cf4dd0711a9314f5d SHA-256: 72b0bfb3d1ad6f0b065fe80db9637e6c2b13230a86c08906fec1c2222d38ca48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://erbaytag.com/resimler/files/kakisunewupesejar.pdf In PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/retow.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c0738e4d0dbad99f48a3efde11bcc977/wawavizet.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/34771085404.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lemekeliveman.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161346e958c6c7---57145155342.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/rabonofipumuleve.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/10769133283.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/juxififed.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9892438dd6d4eda4fda7875799b7d46e/gamefubelexodele.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fizovisikilidurum.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/44831968991.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/maguwonuxirejusanuvuzosad.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/zakolozakezop.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/25613180007.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/xojoluxajatiwifiwomowubis.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wibejagusifinamel.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/58558084692.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/xugax.pdfIn PDF document text
    • http://japhina.com/upload/file/zajolukoligefedimuravet.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/wujunexuxal.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/1054209794.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/50182991061.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/71616419289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+splash+screen+in+android+studioPDF 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_off0000b344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB344 10788 bytes
SHA-256: ee7def715973bb13f16ff8e43c8d96c8e577a696f71edc9252af91f8d87075a0
font_01_sfnt_off0000cc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 15476 bytes
SHA-256: 1b111500fe57278f400c5b0e991f6a4d75507bd00491e42222a8ccde131bf742
font_02_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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