Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d957242263c371…

MALICIOUS

PDF

63.6 KB Created: 2021-09-17 23:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65aac1d66d4911a05a827e7da73c804d SHA-1: 5837469b5ce1d641e6dc2806ec581f58644ac2ac SHA-256: 38d957242263c3711ad9202dd46ec0699952f8dc5da7ecd4af195be91c818f58
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to various domains, some of which are identified as compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to external URLs that may host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8566

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 https://smidgel.ru/uplcv?utm_term=poco+f1+official+rom+download PDF link annotation
    • http://uelzecht.lu/userfiles/files/59629904648.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/29677370863.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912175416720463.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7d2d6eb2---rotifinaful.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/8977853125.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/buxunoputazano.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/45033218659.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/11864572066.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/kudeji.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/91730717436.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905180302650.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/fozitiwemugonepijipuzuja.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/79454504173.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/89669842109.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/34838561570.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/jeresudulekux.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/46103618941.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6k5lr4nou4ovn8kmd81ng8crvn/vuwekox.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/rebugigas.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090901573580554.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614464dde443a---biketafigux.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135acd92d289---74507130453.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/pilegawirijapexagigenog.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/81318512937.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/51882624603.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/36542789906.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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10376 bytes
SHA-256: ba99963253a46f8fbcb30938c89b804fbf2ce40fcac15519673064dd73b879fa

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