Malicious PDF — malware analysis report

Static analysis result for SHA-256 c026932fa40e91fe…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 09:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37b69e4005e83355729bd026328ee066 SHA-1: 16ffd06456bb941a9c28265916b575168b2f0f3f SHA-256: c026932fa40e91fea4086bd4a50117ddc11450a50db58418558b0f43f2412e12
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The embedded JavaScript stream suggests an attempt to execute code, likely to facilitate redirection or further exploitation. The presence of multiple distinct hosts and UTM parameters in the URLs indicates a coordinated effort to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=sniff+android+traffic PDF link annotation
    • https://rent-1.es/ckfinder/userfiles/files/5125468185.pdfIn PDF document text
    • http://gestioniarmatoriali.it/27119838707.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/magixugemovavurejew.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613de06e0097f---vukefana.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/vepemajetiwuleremagepax.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamevovawopo.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wajabesepejufivi.pdfIn PDF document text
    • http://minerva-collection.net/files/files/buxokogutesamojavexewone.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/31869583269.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nizesudemadepevovusubimaj.pdfIn PDF document text
    • https://ratosatu.com/contents/files/jibupetujojomatosunefase.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xipef.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/55286337779.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/60741149807.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vekaligidoxena.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/vevinenifukofigunemamax.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/46729302a7365d8c277d4645bf8b5e0d/maragiguwuvamab.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/orpe4ph216clhibt7rpu5uocb2/pogerobegabekerirusabab.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/24787686997.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/baresokejitabatefuduxa.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/kazenevixejedabapivasop.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/23929099754.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/40174018730.pdfIn PDF document text
    • http://belniig.by/public/file/43203806956.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/dewilufoxexubivadur.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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 18248 bytes
SHA-256: b427847339121f7cdf58ecc8c60e93acf14f26fcdd9b5a5499bfa0bbe454c56f

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