Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efcec6b90337bf3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 13:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b16f8589614c5b93f15dd03fca3e8750 SHA-1: 440b9630752827080b873493690a3e5df80730f9 SHA-256: 9efcec6b90337bf312cc4fb93f57d84e587ea0ad95401579d976dafd0981b347
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and presents a link farm hosted on multiple disposable domains, masquerading as a download button. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tahyuh.com/uploads/files/202109040606205483.pdf In PDF document text
    • http://samurairamenbar.com/uploads/files/55946451959.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/30023563490.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613805f13eb14---75429818690.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/73430076654.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/lipodimev.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/54147858949.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b613dccc07---76210703372.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/81196117121.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/evqu2bha3bepfhv2kqn95dqji5/jizusujiwakilorilujulifeb.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490ca13ca42---95696852882.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/jotijaxel.pdfIn PDF document text
    • http://firegallery.ru/img/upload/ruporasixutulexu.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210904231625.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146531f59429---masaginupujavadosuji.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/fodebujevoxusupudufabew.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kevuzibigarezoge.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/likafexowezumavomak.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/abd8e29165661d41dd9e3e27fcc9231a/95880376938.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vomol.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/rajixi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/sajeliboxebudobawo.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/bidogug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+system+recovery+apkPDF 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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 18600 bytes
SHA-256: 9970b1ad688282b6f09f6445a5da0e3ffd5d770f4f1457fdb3d6dfda9e58b91d
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 10884 bytes
SHA-256: 8d1046665064a7bb1ae3bcf12cb8725fac3a0839124f5e964ba697933cbe58c6

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