Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd234bfb48171be9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 00:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fd6e745e59de0a9599a0447070d3683 SHA-1: a358599ee57aaaba16e84b7021fddbb5bf564f1c SHA-256: bd234bfb48171be9fc2b4a0f9aa25bade022da9fabc0f0eff8fbda82aeee3f9f
154 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories or disposable hosting. The primary goal is likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7779

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 http://mikailang.net/userfiles/file/20210502223847_1160690347.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3e2273e4---futixoson.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/68738605603.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/nesikelegema.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/78147671125.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/kosiwomefamuza.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/40728222000.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/jitikagugumazubu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa58d1cb651---4487367001.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/28668200164.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/liwirojivudazipav.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/92851273975.pdfIn PDF document text
    • https://puntoagricoltura.it/file/dorijemosupewuba.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160902a10d0bb1---dolagapavifenagilonota.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073173becb4b---fuwuvufox.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zabagaxu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/53127277032.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/3547319046.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/160447a3b3fc7e36adf2b3c3da5421cd/kopupoxadototelevuf.pdfIn PDF document text
    • http://195exim.com/datas/files/82999399837.pdfIn PDF document text
    • https://festacontinua.it/public/file/31623708478.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df7b6eacc18---gubaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=basic+concepts+of+business+economics+pdfPDF link annotation
    • 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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 17216 bytes
SHA-256: adf442efc0776f22d01380debbdad3318b12ad3f787e31661d0a96d8355d3f07

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