Malicious PDF — malware analysis report

Static analysis result for SHA-256 e122c32d95a0fbe2…

MALICIOUS

PDF

57.0 KB Created: 2021-09-29 06:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3c407906b3d7c8d6e42c654016e39645 SHA-1: 3c4ecaf3669510368601cc95f428a02258220307 SHA-256: e122c32d95a0fbe21cc107f5c7792e7f40a0e5cde09623041e776eb78c00f88c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and numerous external URIs. Several heuristics indicate that these URIs form a link farm hosted on compromised CMS uploads, with some pointing to disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

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://synerhu.ru/uplcv?utm_term=modern+combat+5+mod+apk+download PDF link annotation
    • http://donkaew-furniture.com/ckfinder/userfiles/files/palaz.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/49127311542.pdfIn PDF document text
    • http://z500.si/files/pizodu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0va2h1rs84mmci3q9ehdc1c7ma/40119648750.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/gamotowore.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/gonapugi.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/zenizulesoxewaduze.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/rubureninorexina.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/38235847223.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/zuremun.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/84782629975.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/19483066917.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/25686937780.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457249f089c---vudeziwigipotu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g4s0ngae151phc9s3fuip17ha9/gaxubenegivojasogosezerur.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/73487678174.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1632816302.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210915/2132307577.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/jugijaf.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144417dde3a3---gunenapozemovumibasap.pdfIn PDF document text
    • https://clove7.com/userfiles/file/sevulom.pdfIn PDF document text
    • http://camonetinternational.com/files/file/42355468035.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea49eba8d6---14320083405.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109250313449099.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/52728136156.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_off0000b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 15712 bytes
SHA-256: 78d8fabd6139dd9364e4816bb5591771c667c77c20a5e060b8052a42bcf44578

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