Malicious PDF — malware analysis report

Static analysis result for SHA-256 9134e03f6e44bacc…

MALICIOUS

PDF

91.4 KB Created: 2021-09-23 04:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 835c0c0d983a83824b7b73bca790ffc3 SHA-1: f606bcec7ef01342a21f9e1c2bb6bf8f7fc49191 SHA-256: 9134e03f6e44bacc7cb9a8cbb38995fe9984c419c6948dc73e7ab957bdb018ef
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2934

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 https://ketchas.ru/uplcv?utm_term=sherlock+holmes+book+1+pdf PDF link annotation
    • http://noithatnhapkhaugiasi.com/luutru/files/26121966450.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/2862087323.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xuditilaxarurobajadox.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/josinunuwefanizixe.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138969a78c05---19313054267.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/wetemikimi.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/79900358500.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/vimapuw.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/baravewoxe.pdfIn PDF document text
    • https://n-tlg.com/files/file/towesonumetepafizi.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/72639642900.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kbmkv1gpoibccl65op3o30hmqp/dixarejidenezawedelinir.pdfIn PDF document text
    • https://onlinendttraining.com/files/vegalesipibazewara.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/zarovafimabitudosoge.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/bupipipejugaxuza.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161326fb50be92---7288623590.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/sifexafegiz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16144ffb1ce121---73740616167.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/miwazidemivamobaboruvisel.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/36559272830.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73c473611---tugibukepomumujokilovot.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/fuvenigozeranizogawuretok.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kekotiveguvek.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/lumujawonodavop.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/gipuzamelovanafedol.pdfIn PDF document text
    • 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_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 20752 bytes
SHA-256: 4d592525430f6c997c7f9b180ec1a12ca0b026bcddeb8f5080b2ce130904d406
font_01_sfnt_off00014b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B99 10788 bytes
SHA-256: d5a263f3d610648a66ae256feb7a5e2ce034bcbf96a47eb2e4f82a7b43de0401

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