Malicious PDF — malware analysis report

Static analysis result for SHA-256 984efab8a83ac1ce…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 16:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5d11131328f2039011fc28048956178 SHA-1: 701a61b3eafed523d1fe9256f2e09c44206067cc SHA-256: 984efab8a83ac1ced1426abc4ffd1f3c187741df67bd04170c931c5620052ea4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to phishing sites or download further malware. The presence of embedded JS and a link farm suggests an attempt to exploit user trust or automate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607730b1ccaf1---satesekevitot.pdf In PDF document text
    • http://dmkaudit.sk/101/upload/file/29801940164.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/68563962699.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/zupubuwelideze.pdfIn PDF document text
    • http://fkhd.cz/data/img/79925106818.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/kebimufagiweneganorunu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c580b109---36601871405.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wolubiwu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b98da99092c60b612a1384486617622f/xanezedugoveravabumirotuv.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160989472c4720---pumukipamunurugo.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/9065247721.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/gifetodezutibisexo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/51800316829.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/59112b37980cab599831a7db86e76bf9/16667882400.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/e626c87aca47a9e170665a5cc32e55cd/dabipozemufisodelu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/vowudoponetibivari.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210721055011.pdfIn PDF document text
    • http://carszana.com/image/upload/File/zofamitakusol.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/rogorebasuzoj.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/78191107155.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bebcd49461c67ed994976fd2c7bfc797/dedugutenusegizodan.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161298efadef6e---91847871242.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/58d3831c37de1b9f78ce23bba8fd16d1/vibujiwodunelepojuvameja.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f67db2488---60535418712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=classic+bike+magazine+pdfPDF 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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 10968 bytes
SHA-256: 30bba2bd742bd81e1722dc02f79879523997e4475fe52bf3593aca2769fd7314
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 17344 bytes
SHA-256: 0fda1af4f0d404c569a1e5a7808bf626ed8c3acccb0da2ea8050119ed435a66d

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