Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a74c66ef39e51cb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 05:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49f9d146ebe432d8133268197ac40987 SHA-1: 33c1371040a9d031ec785db4530bc9a1b7974162 SHA-256: 9a74c66ef39e51cb88b944d1d18639d0fad32f1a77c167da906edb0694dccbea
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF containing a link farm, with multiple heuristics indicating its purpose is to redirect users through various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.2340

Heuristics 5

  • 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
  • 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://hide-bo.com/img/tmp/file/29557258369.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161422dc58c8ad---deposumomamameretokoji.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/21837736299.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/ganirewalozuri.pdfIn PDF document text
    • https://renewone.de/files/pefut.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090203014280554.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/81183201663.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910150038.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/94729827012.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/pufedakerawesokuvowifezu.pdfIn PDF document text
    • http://ipublicity.cz/data/file/maxinovalenasezolazuradob.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/xatix.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163159632114464621683.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/abd27394b9634d2b73302d1cf4e8d3dc/kilakizelofemojam.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/94331221328.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614541ab17ca0---xozeweremijifuguko.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/wobufenumigemafapujusutux.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/14721269507.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/didirikaturuvofoladenupef.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/jofoluwimalesovavijexosix.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wuxidi.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/8719790016.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/79990081862.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210912_011909.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/udfo608n67dt1qavjkrkqs5t26/95932521995.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142979885190---1348373617.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/46764571849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stock+screener+apkPDF link annotation
    • 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_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10396 bytes
SHA-256: b3de8464781e575ed3457bea7b7812cebe71b5f5dc0a33b3bc3e67cd8b6c8c69
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 16324 bytes
SHA-256: e02f7a2c62afe0e867be0da5a6f2f525b9ab3943161d924a42da68a9fbd817a8