Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b42b7efcc18e434…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 10:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b22510a8e0c8baa2c7bfa9cbfe11d3c SHA-1: 0123c3a712383534ec65fb8d683c01de416a3038 SHA-256: 4b42b7efcc18e4343a8192b17832eaf45297e4fa9b6b8bfa12462acf78294a4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and link farm heuristics indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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
  • 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://allytemp.ru/uplcv?utm_term=hololive+live+wallpaper+android PDF link annotation
    • http://kronospan-mofa-hungary.hu/editor_up/77620486420.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/21414241595.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9719c1e8aeafea315d72620f5904c815/wajakololoburikizoxijobap.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/50920934438.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614170522928e---nomareteruwozut.pdfIn PDF document text
    • http://parilka.by/var/upload/file/nolomotiwabaxu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rowipejajonelarep.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4fcdc98a50b528901906165f6a684066/lesiromidupixefav.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/poxuwasejixirivavaxatana.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/76074541142.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/48537297186.pdfIn PDF document text
    • http://frchem.cn/upload/files/81489848019.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036dabea67---72704678519.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/lufetatiwokumadoti.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/42880272495.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50832792207.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pumimomovuxegufuf.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/tesiguxejotikiso.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/vevageziporo.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xidabizavizo.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/zakekimozide.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/49785982668.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-24/20210924162415926086.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4f28b7676ff869544863dbeb90d2b7a7/zurotamodoxore.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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 10264 bytes
SHA-256: 06ce206d3e3acf9f25cdfba18576623f009ed648ac691abb2af413cdcf95005c
font_01_sfnt_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 16704 bytes
SHA-256: f9402637485f56185944e90dffc99089e842964e36ed83f760de4de90087a6a3
font_02_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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