Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee91ce6826030dd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 21:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 132d61462d947ce5b9a8ae50622e0c81 SHA-1: 505ab0073f070059f83620507a933359ecdf5853 SHA-256: aee91ce6826030dd6b4e214859198a8d493d061ea871b3efc958101d68590919
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=how+to+save+a+note+as+a+pdf+on+iphone PDF link annotation
    • https://tlkingatlan.hu/kepek/other/file/lonazirurijugoraxup.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/rerejamidozan.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/figoniwibojutuginu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614159c1a0363---68870191181.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/47117200150.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/xogumesibiweket.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/titugur.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_21_13_01_19_3764.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/3503112425.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614af2bb300ae---kexewoxebudutejoxorulom.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd8c0f8c7---laminaf.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/72304831644.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/78100202454.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff405b6d7.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/jitewira.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/92c0232586e5e22846e4b63694d7a409/wodinujuxazivifugovaba.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/dumovet.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/73799391704.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wugorokexutitutegofufebix.pdfIn PDF document text
    • https://kopari.hu/files/file/kuxewanoganidef.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/96482953882.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/79966675545.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210901153507.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143f2d56ab8b---pifixirefibudawel.pdfIn PDF document text
    • 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_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 10592 bytes
SHA-256: dcbbe1a5b19b7fdbf6072e5b2c705559a79af569589f1dd4cda17edefd4b7175
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 17436 bytes
SHA-256: 89109a08edf5b5fb2ae14040326312b0512110e3e1ed7bd3e71cd56316425cba

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