Malicious PDF — malware analysis report

Static analysis result for SHA-256 e743c2cc331e59ef…

MALICIOUS

PDF

104.9 KB Created: 2021-07-23 09:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec6c102f7fe81715f3bd38dff57b11fe SHA-1: f912e2685a2af08d6bdf86c220609d0fb981c399 SHA-256: e743c2cc331e59ef442a36053f8f55eeb72986b539d8850b6e9b7f3cd9f1ee37
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories or disposable domains. ClamAV detected this as Pdf.Phishing.Trojan, indicating a likely phishing or malware distribution attempt. The structure suggests the PDF itself is not directly malicious but serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

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://randalljroutson.com/clients/44711/File/zoxuf.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3602d8a2---xazebi.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/lerurotegirewipe.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e8cb4ae06---87615383932.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/85213892117.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3e168b4fc8325e104b47405883ffaefc/kagupijagetewodukubejimox.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3390275f1199116dac8fe24c532aaded/68483618756.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5864c72bc7---supazuwek.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/66494705026.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/71bbef8716bff7d9170964c1d0e64b85/29703153491.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a591500691e95b844969cdcf85562b83/zexoj.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/neniburikilibapefab.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/47fe615fa7886f4e7e157291c8dcbb9c/20712520729.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8ea31e7d---bosugorovufabijewepebi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2d9dc79996a0b865e27758e725d2b100/53238201000.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/35615739071.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749f3a76851---9038463948.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/fiwisuxowonimagepiwaf.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/40861907085.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/74286333303.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/49856919033.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/32688679030.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/92277146447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=richest+country+in+the+world+2020+listPDF 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_off000149ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AE 10892 bytes
SHA-256: 1a05d7220572fbfdf8143a177bb33c987b0bbf98f4b7561a01a40bcecbc97e3c
font_01_sfnt_off000162f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F0 17732 bytes
SHA-256: 21fcde234734691708586632adbfa172448d4549380bd85a7d4692576bf3591d

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