Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d099a5cea00e0a6…

MALICIOUS

PDF

95.4 KB Created: 2021-09-06 06:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4525b2b57fe7fb56ff216da494e9b2b5 SHA-1: 31c11bd4fbd478c4d9765464ff43aca3663192ea SHA-256: 4d099a5cea00e0a63b175c3a42598be20698dfc355c9737cfceffb1369dbb2c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://beruanglucu.com/contents//files/69790663911.pdf In PDF document text
    • http://togclick.com/media/userFckfiles/file/tosipa.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/87702260007.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4affe24b5---80747387455.pdfIn PDF document text
    • http://sukhabalka.com/files/file/vapesofev.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/suzap.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9c6b29ab---32358455314.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///tuwulita.pdfIn PDF document text
    • http://fitviewer.biz/files/file/66251291761.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086d82e2dafe---bokufotutumoxamexu.pdfIn PDF document text
    • http://homeopathyhk.com/files/kugitavekamege.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160890e6389314---dedikopotawegiwef.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/badob.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/mapuwofulewola.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/46507468051.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/kukobi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/biwosenuxujofufi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93884e4b86---9517156730.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bfb8f2e3b42b05163dabc2fa6658af00/33520371372.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefd903e0a---mapofelimuwa.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161127a8fb957b---33805981173.pdfIn PDF document text
    • https://unosms.us/userfiles/file/18924299840.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210624071340_fr7o47.pdfIn PDF document text
    • https://hssanesteban.cl/files/kadudesapusidawirigikug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pie+jesu+requiem+faure+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_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 10668 bytes
SHA-256: cdafa40de215c393c0474ed87967aa289f7fed09c7a8ecdb9a1252f0d20e3b75
font_01_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 19440 bytes
SHA-256: 604c0a33f67c95b7d1ccfa2c00790c56e66c4cc8265ed4628a7787b18e9a2f89

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