Malicious PDF — malware analysis report

Static analysis result for SHA-256 b724cb71c9da806a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 13:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 116bc4514e7c5e56787d4e89225ca6a1 SHA-1: dd3155012f3f4b87640d1acc94218d8bd765635a SHA-256: b724cb71c9da806a3c40c59b792a6035bcef7360ec1874f4669dfb974bd7e364
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://akproauto.com/nbloom/fckuploads/file/94717150143.pdf In PDF document text
    • https://efsanepin.com/calisma2/files/uploads/bixeputob.pdfIn PDF document text
    • http://hydrem.ru/images/file/mejujobexiz.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/36730392039.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/29342996939.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/72011691361.pdfIn PDF document text
    • http://ellev.fr/upload/files/jizomafa.pdfIn PDF document text
    • http://wawa757.com/uploads/files/49027167658.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/8601389126.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d665985dc---vugesuzevo.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/3221343039.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427e6ed1951---30330541125.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/97237508859.pdfIn PDF document text
    • http://come2menorca.com/images/file/joloropuwamisogaxuli.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/48fa92fb32869a703fdc3f3991349894/36744298239.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161395500c445f---91635695692.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/16689802484.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/425529877bd0922a4729af34791e0444/xogowamavefekomegesudawi.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/vixatupitanitefenuzusobe.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/nezuzewixuzejasurule.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/58436671869.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/lekekifizikejizuzedi.pdfIn PDF document text
    • http://scro.ru/pic/file/nefinujirakalali.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/luufrp9j9fl148t1vibg3qpm7n/penobukibozob.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/jasowatiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ataque+mitm+androidPDF 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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 10424 bytes
SHA-256: 3c909b130ea203d13c19cc1ec4754428b97daca48903640ef1580041653c486f
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 18692 bytes
SHA-256: 64004a1c1c3383204d15338e60ce91e46eaa16fee7ac02c2a552ba20909cb248

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