Malicious PDF — malware analysis report

Static analysis result for SHA-256 e437df1bcae20e66…

MALICIOUS

PDF

65.1 KB Created: 2021-08-19 07:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8364ff32008370a41ac9ac2b4bd4a025 SHA-1: c48de81c96e74e0ce412e1f14d3bee2dcdbefe60 SHA-256: e437df1bcae20e66eceee1c0e34ae0f3d81b1f47eb884dc5455d9d2257498c16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8628

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://eko-inwest.eu/upload/file/vupimirovotodalab.pdf In PDF document text
    • http://esistore.lu/userfiles/file/maromu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8c64a273193eadc7820d74763ce96ca4/lakadedamikaxivokiz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cae6a4d3818---tizejim.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-2/20210602174906787264.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/fixuvo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5b32a8a5f---28348795817.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611903919e5b8---bibawuvafaludari.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/buketitunuzasevaraga.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/84681244074.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/13866468570.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc7daa1e32---resofe.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/janidagilarop.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/bexopojedunetupiwerizesuk.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/kalixidufemudo.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-11/c5481bdb00cfffd151696076016e5161.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jabumaworozakenu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/teferozomaloxewobi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t73et5jc84ab8kuq9oq0rhaou7/rokono.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c80df19de---wotiwadezibebodubixut.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/93197009748.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ac74c0da---nasevegarime.pdfIn PDF document text
    • http://nova-auto.com/upload/finajojaxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+the+volume+of+a+cuboid%EF%BF%BCPDF 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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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