Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b411eb91b76d42…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 23:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d79859055b7dfc0eafee278aa48b8f61 SHA-1: 16a25024030f0357ffd8af9aeaade932e0f92a45 SHA-256: 92b411eb91b76d42c13ceead2eb8bea7cf77d3a4c0e45b93bf433b46c3ac4bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of numerous links, including one with a UTM term, suggests an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lkjmosq4rngt1720ujnt31gq1c/1940619017.pdf In PDF document text
    • http://hvezda-pardubice.cz/files/file/zerijitiboribinijolap.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c20f6086f8c---83656197210.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210706223016.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/426e01c1052ac97c151551ac5a32d070/tilefosiw.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/pazowedoxisonebusemuf.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f642f96dda---65540893893.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b526d19df2e---54502240883.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071994caee86---memor.pdfIn PDF document text
    • https://pixel.bg/img/file/94566896611.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/xejaxasoxasabe.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ba99cf0d---xuzudizizax.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee30945609---65396144216.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/xowoxuj.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3badafc1c---21318404527.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160faf161be885---tadofolitesoxuwido.pdfIn PDF document text
    • http://devison-matras.com/upload/file/90568708506.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/rulixilemosadesufisamopad.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33062df8bb---nimoz.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/9161342953.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kf1lo8i0d0vlq59jqh0n6a1bj3/ritinadetapuvabu.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/gepizatunaxapafazevona.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/57809908180.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tulalezewebuwunogikujajox.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69476d837---zulovifusegorewewipuzopi.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/72075354095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=shiv+mahapuran+in+bengali+pdfPDF 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_off0000c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 10940 bytes
SHA-256: 012d5c84e457eacee3e1825bd855bd9cacded1635e544109a2aebdc636ec5714
font_02_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 20472 bytes
SHA-256: 9160211fa2314e5a9c1c39cece27df9e637e8811f4c7ac9ad3facfc818f6c21f

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