Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b15066542f0d22…

MALICIOUS

PDF

85.4 KB Created: 2021-07-19 23:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6137154c7ecd1ce8bdbf9f915553a2c7 SHA-1: a26e8a199dea1a7f79fee2aaa5b39be4604a4e56 SHA-256: e5b15066542f0d222ad7577fc4dddacf70d7ead0a6361446f0383b7aa20d2b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely serving as a lure to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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 http://kiemtoanhaiphong.vn/upload/files/zajulitumit.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e56e4e21b---30724669533.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4aba14869---padin.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/95274410514.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bd31606b0cbabffa25d0586cde463644/wojipujazagunoxu.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/21465087875.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tegora.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/32981d1356a664db3553a2686ff94fb8/xabem.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/49703294613.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/50824543370.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kulabanolafedekuzurep.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0a90ba66---1756352245.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/63319949543.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076639c48cab---dunoxisit.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/74269907805.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/94746075830.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/tufule.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fb37c76f9796fb292194cbf4fe8f96fb/56666787170.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/76581984530.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/likatunidumolipigu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074617123e73---37538748432.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/ribikisutifelakafegisev.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7033d64ef2504e41a3fc987b33a6816e/rowiwawuganarilukasumov.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/sijote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+phantom+tollbooth+beyond+expectationsPDF link annotation
    • 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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 10996 bytes
SHA-256: 8cff1716ef37a7d2ee4a7c19cd390cfe5552a003f1810b6322a1fab6159d3e1c
font_02_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 17000 bytes
SHA-256: 1a1a620f28272daec864a5ee8e5afe0a84ca8c8dd23800eb8164d89278ff718f

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