Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54198faeb1851df…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 20:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a15942d75fc13de34f9577b30858cd3 SHA-1: ad5b7436163f99036a89e0cb03d0c92c94feac9b SHA-256: c54198faeb1851df354b273ee90989f987eae51f609f12ee8d5aa566b83dd48e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adsbudget.net/userfiles/file/botigo.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/eba0d2ca65f7bf059e887ba6745e1e9e/ranujinipozogalefubo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/911473eeb1950171bc04d0a88821cef0/nuvalaf.pdfIn PDF document text
    • https://birudongker.com/contents//files/97232416079.pdfIn PDF document text
    • http://halmar.info/userfiles/file/58855285542.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/dodexodonidelerubi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088058e6e34e---6775735479.pdfIn PDF document text
    • https://davaocarrental.com/images/file/galatuk.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095f3cf9e209---fukobeke.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/toteluxubawisafijar.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/mubewologijaw.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160712d95a75cf---5531100272.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/53839892175.pdfIn PDF document text
    • http://zae.me/datafiles/file/zalosiziwu.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/19463200111.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/busakijuwimomanigexetutig.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/85706938950.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd74bb009---pipuledumimemilugini.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/44201f47825a4c8ca690685696e7ced0/minozisakapobinudovu.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/patamabofotemobanobavubis.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/19fd2d1d78f7966d3ffac7eb8568864c/37863622010.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8c35dbc97---levomokifufevasejiwume.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/61879891123.pdfIn PDF document text
    • https://steammining.com/userfiles/file/91264068384.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/47195561063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=civil+engineering+solved+mcq+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_off0000b8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BB 10948 bytes
SHA-256: 1170381ca4e911ae6c18951783ce39b44f28715e52b319c98d5b2f72202dfd81
font_01_sfnt_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16564 bytes
SHA-256: 38a4a597f465d990e7e5ced69256f035320f0da4e2f664eccb5071993416f90c

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