Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f7d8223dd78f7e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-25 22:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14d850e667779ce2457d1373af336491 SHA-1: 5a4b2ce1af4fc0c49160c0f4507ad526b7d082a5 SHA-256: f7f7d8223dd78f7e2c736221932df57ac2c25d904d2091eb5c1e96d23c0a5c26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of a URL with 'download rom redmi note 8 pro' in the UTM parameters indicates a lure for potentially malicious downloads. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kewatefulidonuninerubo.pdf In PDF document text
    • http://pilot-market.ru/new/files/file/jupag.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109102102384444.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/50047163741.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/10088707735.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed8c0e834e---tesakuninudaxi.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/9462156455.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/4723514705.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/35965870699.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/nelifaxigejemupovuvujegi.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/38787329680.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/65021387302.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/12001933430.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/76031531390.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/41725941031.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/6348820126.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/vetamimovolarilax.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/sebizobexixefezilalusugi.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/68295281305.pdfIn PDF document text
    • http://atek-ent.com/upload/file/77949898580.pdfIn PDF document text
    • http://hueide.com/upload/files/3539654313.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/60107667288.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144862a1a072---luwaxojijafeborasomefat.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa3aeb9623f8a56e723d2c67b08f9fa2/98953488278.pdfIn PDF document text
    • https://hinaweb.com/upload/file/3492204598.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ea4868f5---sajebupilowadow.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbda605cb1---84305039103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+rom+redmi+note+8+proPDF 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_off0000c29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10680 bytes
SHA-256: 6c1214f7fd4439822ef0e5b03cd869eef47faac65b6b5f2253e0f3950ec985af
font_02_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 20596 bytes
SHA-256: b725d0aad0097960559e48352b2374bc77e5d78686bb95709d57ff928170d02b