Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b729e1bfeb4543d…

MALICIOUS

PDF

70.9 KB Created: 2021-08-19 03:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac9abee607707d68d94b370efe84b528 SHA-1: 9a5f53e6817bdd15109641ca90cbb318362c18df SHA-256: 7b729e1bfeb4543d9ecd63fb9a8bad24063eb1d8ade6a729e9139c9442e256aa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious websites or facilitate the download of further malware, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9290

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=how+to+write+a+short+story+grade+6 PDF link annotation
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oqb2ibmrbvhb9q8bj46pftpah0/21787437194.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080220042453.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/peroruferojomuxu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610762327c049---18680878791.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a477c892---vewaloramogineluji.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5046cc5e25d085a385ba38c63e465f5e/25030136160.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/64235702273.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/461098879.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/rovafumu.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kuzes.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/327079a7d5072f4c2b1bef4e130d6ae0/pipugepuwuferitijo.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/55855224690.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071adc32f634---siwitamonobuvisase.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/vekigekiwopuborufilin.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/91843745678.pdfIn PDF document text
    • http://caramelitos.sk/files/tozikabewu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161f47871e---99738280988.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/jejem.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/08ced79566f9c2ccf46f1ccd9193efcd/lipobubidobamo.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/mujejuzosufukirutekejel.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/94278099493.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gitelal.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_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 10736 bytes
SHA-256: 55d30f9f049e1bd5ecba93e36fb1fb1e4b4a6fdf9526f8aaed8717abef9de136

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