Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b4254cb576c945…

MALICIOUS

PDF

94.7 KB Created: 2021-08-05 00:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: eb7f5865a63c4d227ad21315598a81de SHA-1: 2ddc415167bdb02eb7babadfa943083032df5477 SHA-256: 65b4254cb576c94507ca6fe38d9d38b57b4df3783d9ff1a4ba720cb6db4d9417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7577befdcc---73557681096.pdf In PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/20727468722.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/652abe7961359a6a31346df726e20ba1/domavilewifisinomewipiniz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0aa67252---kidawekapujusake.pdfIn PDF document text
    • http://amandamaitland.com/images/file/98564043709.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/7411755893.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/13551011716.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde5628eb5---64490134325.pdfIn PDF document text
    • https://codecs.roimages/file/bakaxoguzajujabunixa.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/71470506684.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/82469168731.pdfIn PDF document text
    • http://malifer.hu/upload/file/2446004621.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/tosuvopomoximop.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3a01817b5---15321486580.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/majenoroz.pdfIn PDF document text
    • http://standardamulet.com/files/files/57264672638.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/80151238635.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/38355786634.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8p56shh0ck2f2e5ppteum0b2ef/tatifewidemawubuvoret.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a79b5e6a---99061431376.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/putalumivelonipasobuzi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/52b28155a072ab707b9a6f9e35c4b29f/vezeloretarede.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/r6qoolhf04cckfjhodsrtdbftk/nosojeberosenefudizexes.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/13955270556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=norman+finkelstein+la+industria+del+holocausto+pdfPDF 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_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 11056 bytes
SHA-256: b9a2342b38632e8cced2fdd6cdda10f17d15ab69f4d8ce8e64f4be5a3d94263e
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 18460 bytes
SHA-256: 37ca98e99c4675c946aedaa27682ca884491d250577143486e425be44eddbaaa

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