Malicious PDF — malware analysis report

Static analysis result for SHA-256 4843cc2e72b6a982…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 02:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eeb5d2674ea4c6da374881f85948d8e5 SHA-1: 36414fe64a8b369418108084c6d08f719a15d3ba SHA-256: 4843cc2e72b6a9829fd39369b50d09c70661296c7ff2fc3734694957072b5b9a
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links are likely intended to lead users to phishing pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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.
  • 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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f3b11310---sanupefufijeka.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160813b20d2818---jexebixekadefikusawu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b859e2dfd1a---60929158949.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/zubegat.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/51e8ae0cb5c4fb96cc7dbaba4276ffe1/jupigezimizod.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/59a8a7b2f3cf1d95ea423f8235484bb7/meborapomikakiwulalokul.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611301a7a0313---vokive.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/sozegir.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/3716883903.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/zezotizugejokuli.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/89977497622.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8004acf59---736185879.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jd24s73qgnp3r68bhcnqltp521/razapakolekodozu.pdfIn PDF document text
    • http://rongqichem.com/upload/files/rujexened.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/febubelati.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfeb255237---rilotoxonolavorepazu.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/47090171834.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/94187989010.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/86855140665.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161167e11b2433---96875069204.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210604200535.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/letujotexatedo.pdfIn PDF document text
    • http://moristas.com/userfiles/files/33425954319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=history+of+gender+equality+in+papua+new+guinea+pdfPDF link annotation
    • 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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 17396 bytes
SHA-256: 931e998a2afecc7e1a9dc73b760d4ae40f9f00d23111f23ecf4ad07230ad536e

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