Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d54363e47a2415…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 08:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1896450d27bcbc9cda3b497605e3a58 SHA-1: 6cbee126514a94e9db8cde84abed881623b278c6 SHA-256: 83d54363e47a241573e3a1a608e6d5f49a0baf8337da7096e6222fc25e5a8efe
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 contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of multiple external URIs and the overall structure indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://erictex.com/ufiles/files/pubotadejopole.pdf In PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d9116bd890581de0d4d3e23ced698a16/50326189018.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1a18d795---polokul.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0dcff4824df10bcf92d41353083c7d7e/rinumaz.pdfIn PDF document text
    • https://medpressa.ru/files/file/99850411643.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/panibubawuzurisu.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/1046670122.pdfIn PDF document text
    • http://skolky.info/foto/images/file/sudurajeburujiwof.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210827_6CFADADB72E54083.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075614ab2a00---733450606.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a23fe312707fd816a0627f12056264be/fumapepu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u2uvh75g3eg0jaqnht4fpk5tft/tipiwore.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/lexadis.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e16fdbccb---80948438186.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/70b08d63183c7e1c36bf1aa79270a3f0/88486809093.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/palejurivimude.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cc71148db57---12161580849.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/7svo695a5jkujs5qp91v32b23k/sapurufamevikikimun.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b209f86ddcb---vuvatunun.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34eee50812---tusokekafojipulapozi.pdfIn PDF document text
    • https://datawire.gr/files/files/tomomudijivimetixafideji.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f71d397e---12125146899.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/mizagezuwexokiz.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/fovurorekifuka.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/81359488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=converting+fractions+to+decimals+worksheets+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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 18692 bytes
SHA-256: 5b3934712ef42a31e8bafacf432e6e4feee8794098e31d38746406b1de422daf
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 11344 bytes
SHA-256: 15d9405c9a614c48ae1066492336a309efb8d2bf44bc92b2d5c5e5365e19eb35
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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