Malicious PDF — malware analysis report

Static analysis result for SHA-256 a238f4ae0bab2ebe…

MALICIOUS

PDF

91.6 KB Created: 2021-08-12 22:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 543c9742788a79ff32032ed2d883666d SHA-1: ae95c05ad4f583b707654066281403aed7ad6cca SHA-256: a238f4ae0bab2ebeb74353096d06441311f8c6f7859080a43476182ac418702c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://chobacgiang.net/webroot/img/files/tusurelegeto.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vodusuwupetetonalanote.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/fudaragelozizomud.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/40627773059.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/waxesokubivudebedunanugo.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081012531973499.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ddff02791fb---mizunisamajixaramagaw.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/duzukuwafemipaxoluzadig.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/60582d351229f4b4158db3240515400d/69522696416.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dec943fdaf38e20e98e77ff86d666ced/solivibowupami.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/23470089177.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/73037643795.pdfIn PDF document text
    • https://theurbanthinktank.com/files/laraz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc805cfca---2939079368.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lakovopexazujeresije.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc731bcc2b---rararakilenexamibisa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/afvsb52gaii8p8noh2np400f6i/fufopigegibu.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/fezefowule.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c710da29a1---19552595092.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/xomojajaluvefineja.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf636f97a78---fupavowutiwalusur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d07779fe4---16969046083.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/44485301579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=adverbios+de+modo+en+ingles+ejercicios+resueltosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 10968 bytes
SHA-256: 06251ff316b33b2e212f1fd4a85004e1122470dce13d8649a4a0052cd26e991e
font_03_sfnt_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 19784 bytes
SHA-256: f90aa4fddadffe34bb7c58b05cd34862fff2d318e1f6843837215ba4c9c8d40a

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