Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8b7ec34e7fd961…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 08:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db1a1f626585d20bcbb62941887ad7fe SHA-1: 00d366f3a5a54288200f0bf9c3295820e13d8a49 SHA-256: ec8b7ec34e7fd961ddf362395cc4bac957850cc228553876168b787874473be0
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lamudejigumavodaxepevaf.pdf
    • https://bunyaminerdemir.com/resimler/files/56416144958.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/23993441351.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ab1a182e---86163901200.pdf
    • http://pcwenhua.com/uploadimg/file/1631132082121785863.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/70ef4ae977b77c49cc78fe058a523698/22389866755.pdf
    • http://longchimvac.net/app/webroot/uploads/files/defonowo.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/752de7cab89bf6f0bb1dd4b2cf53e953/zawubajemozejebuberiga.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613672c5cd295---powarobepokex.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/mujujerobosad.pdf
    • http://chizclean.ru/files/fck/file/ropegonovipevuno.pdf
    • https://holcom-wd.holcom.vn/webroot/img/files/tinunemometizobikisisib.pdf
    • http://bartuceviri.com/userfiles/file/86576084233.pdf
    • http://ckpak.com/fckeditor/userfiles/file/kirebisunopuzakape.pdf
    • http://quangcaovuanh.com/vietkiendo/upload/file/xuzatenave.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161331784e508d---fupotuwas.pdf
    • https://dehayemek.net/upload/ckfinder/files/mekaredafitukejilimati.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/tepatubofizu.pdf
    • http://ankamet.com/userfiles/file/37133812576.pdf
    • https://speedwayinfo.hu/uploads/file/xaxelodiviwog.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zufibezesaraxezamapu.pdf
    • https://smartcrm.cloud/upload/files/mefotiropakinewabogu.pdf
    • https://siam-royal-view.ru/data/files/65000987647.pdf
    • http://jandenzobv.com/image_uploads/file/kerodujatafatimafetanagu.pdf
    • https://weldingportal.it/userfiles/file/35917973518.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+house+hunters+international
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 16792 bytes
font_01_sfnt_off00010666.bin
2041a69e3f1943065f7e9ad1326c5c77984b7c8b1feea8b5c9e8d77e42a254ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10420 bytes
font_02_sfnt_off00011dfe.bin
0d99a83b9c5798f0d437b6ce82caa90a3e1eca557d1aa21dc4877ec36a699103
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 17944 bytes