Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45a4b96e3b28617…

MALICIOUS

PDF

78.3 KB Created: 2021-08-08 16:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 826e8f92e5ce1f8e6de2030cd2ed2a31 SHA-1: 6f539a82d55d99b4696759ffae43cbffabf44ddf SHA-256: a45a4b96e3b28617f132403e1c35a18010fad75653d411ce99748c24eebb9f23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload storage, indicating it functions as a link farm. The ClamAV detection and ML classifier flagging further support its malicious nature. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e09a4cd8e---rapegarano.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a6e3064f---39417315725.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88c128604---76529720112.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79871a3172---ganesopobixev.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160765b852441d---90277123993.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98b7155de---86372203333.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/59947465028.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/541959c0416ba90cd01e0542d0cac777/kawukuvagurapatireju.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/35531893724.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/8901490879.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609130904a57f---sefinajozinujanuvelofebaz.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/rufokeb.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/84405622199.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/pajemugezirolekasabub.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/19702094302.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3a1849ffc85e386c826b967da862f749/zarokupodajuganofi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/99876861214.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e8u1k24m3scg134b0vlktrftmk/69165779364.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/10058768031.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/80372825794.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wopon.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/2799729866.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210625060331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+see+archived+messages+on+messenger+app+android+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 11300 bytes
SHA-256: 3c64ea0eab87845d8d55fe693f6ed0cd5dc3f4781cc6881863ed06cfe7b4aef3
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 17000 bytes
SHA-256: 306879f42253d65c05955fefa55008ce5dc830d666e6736bdf98a85551fbec28