Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6caa92c1ad6710…

MALICIOUS

PDF

63.7 KB Created: 2021-09-27 17:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d49fcb36a48a6c39684eb5b0c15313b5 SHA-1: a3ecdd50c09dd24caf475f38031a22846ed427bb SHA-256: ea6caa92c1ad6710ee87f341dccc414263af0843ae92143ae3bae0dfa9a0b250
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a large number of external URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6675

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://huntic.ru/uplcv?utm_term=jigsaw+movie+stream PDF link annotation
    • http://yugang360.com/upload_fck/file/2021-9-19/20210919060058877975.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/42850617208.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/pegemopefuk.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/23013141914.pdfIn PDF document text
    • https://keongracun.org/contents/files/42642819312.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/danivomifuwetipigin.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/jemudatotufawevuluzib.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3d56529d69c9f41bf0ab9d3148c74e92/fefasol.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/vigaxufozumipuperurovi.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/zosukoxigerodituzusuk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136249e4f13c---gevetiwetumeb.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d608de9d0---jijemikuzaximesab.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/30553114855.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/susilesiguzofikev.pdfIn PDF document text
    • https://mcorretajes.cl/upload/file/kugulikulovilunutatavu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/xafuxejugifawitupeva.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109181802238265.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdfe424a98---delukedebipegazobobimox.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_off0000af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 10444 bytes
SHA-256: 41043d7f5828ae7d81ad7b9d023db2a6531a199cd2be92942076e8be2c992ec4

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