Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd894a552aef48e6…

MALICIOUS

PDF

73.5 KB Created: 2021-10-13 15:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 69bce1f4926d74b5b4c78ebb65e00488 SHA-1: 316c45f500adb09afcede95b0932d002889a0d40 SHA-256: fd894a552aef48e6c8bf096f9f4343fba965e3e53bb3f1b3520a6c05f893f72f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6077

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=solstice+meaning+in+tamil PDF link annotation
    • http://srtcivilnorth.com/ckeditor_file/files/2547864854.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/zixoxigox.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/52354722450.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/80004318674.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161581c5fc93e0---bopudovaguzufibibonalelun.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/zenoxamamajuf.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/39133375254.pdfIn PDF document text
    • http://kes.org/upload/editor/files/jufisavaxosubeg.pdfIn PDF document text
    • https://interconformity.ro/images/file/13836992439.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/57699159187.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kavuwilukedixakijixe.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/98812505150.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/87b9u9i4lmtm2rf35pb0v1bss0/kuzuparofogukino.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16144bbb57428e---27340430248.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/wujororosexo.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/67229761556.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/monimera.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zudenekesusosixavipe.pdfIn PDF document text
    • http://willbramephotography.com/kokinugulelirapat.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/xuluvukabevala.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/gonizururanel.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kuvupasevu.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/50957063482.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911120529668.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/xukevudunipezifowoke.pdfIn PDF document text
    • http://chinalabware.net/d/files/mavobimatirowok.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/pigopewoka.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/pogokiderenoral.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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