Malicious PDF — malware analysis report

Static analysis result for SHA-256 923ea97c5ade8399…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 01:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08f1370fefdb3d5e70f925ad2b8915b3 SHA-1: ff1474a3ce41ec6fc6d616f84f8d8dc9a8e9fe48 SHA-256: 923ea97c5ade8399012a87d49a3c89db1e7dffd135cadf4f81ec2cc8f538487f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9302

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jpunlah3ru6s8dfrdjsq0rpfib/jegojegerujefisazupuje.pdf In PDF document text
    • http://bestbuyfromindia.com/userfiles/file/50068905133.pdfIn PDF document text
    • http://lizhechem.com/upload/files/90015879351.pdfIn PDF document text
    • http://sartor.ru/upload/files/26366764952.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/15182849053.pdfIn PDF document text
    • https://bonacorsi.it/file/60164902638.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb51757159---38080777716.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/27277831930.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/69c3c4e83b2c42fd8deb792a2b579bf9/51086746864.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/75502596022.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/35a702c59ef9cb1b5df42b2fd6255a7c/levumixisimozer.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/28489532850.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fe00b482620ec5d4ab6393c747cdb7a7/setanobeninoviw.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/56360848977.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/64567833860.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/bojiwofurutejufimezenoze.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff4840df87---pemowitipomixebijeji.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gu0tu919uppb49o89q0p5htq00/vilam.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f451016cef---98103148727.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/62829629715.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610adb232a5ee---sesedumubavumav.pdfIn PDF document text
    • http://isvpro.com/custom/files/jadexekowobejerefujodisu.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-18/20210818001459173297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+man+who+built+america+full+episodes+onlinePDF link annotation

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