Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14ba0df0fd89273…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 01:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 468439d179131d796bcc9f3b6b54b3ad SHA-1: 8e3f9c7353bebbae3d3de6ac1cd973752716859b SHA-256: c14ba0df0fd89273eb9b5d76d1e24462e40b66ed7a44ca184643db1bd9fc626e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://queure.ru/uplcv?utm_term=medical+certificate+for+student+admission+pdf PDF link annotation
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b6ee54ba---buriguwinujogasawop.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/80258196777.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/nozijoxetibuxe.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/31ffb332e29085e5d2b26ddbd22d8c4f/42492758692.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/bumefezupaj.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bff3a703b2e276202cd186afe745e31a/pazenomofowalutor.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902225848_cywhmk.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/pomuka.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/kisowizem.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/burizobifepisufowug.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/6a618fd1f694b1c7aaca335ba88bf34f/55929420434.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/japusonazapipisari.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a7b5843b9507e6536f26dda806aec3c1/gatawepatugenureboj.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/61243818292.pdfIn PDF document text
    • http://axwelindia.com/uploads/67506987437.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6c755b87---30702170877.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a81173d01---95513986754.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/52697893061.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/gafuvutefugetowuw.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/15f8396461f12cbbd041a1cb4fb4c116/dididuboxajikunijewesofo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6b301256e7d4dcc5778bc1c7b8cd6c44/dematu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a521044c4---40086529567.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/juwobinexul.pdfIn PDF document text
    • http://email-database.info/userfiles/file/bopoxutarixasogapajolozit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 17136 bytes
SHA-256: 386a1843847526a8cbfdf5842ab50301706193fae02660427f1537fd4f03109d
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 10876 bytes
SHA-256: 5daa4c1f3f37dd0d4eeb9f479541bc54a0e5cb666ff4b772f75854af8388b3c1
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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