Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4a29fe69c2ddef…

MALICIOUS

PDF

92.0 KB Created: 2021-08-17 10:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e733b610bd08bcdb4064593f232bbb8 SHA-1: 5348036b169ab3b3215a7a1c430f02e4f1ef5d33 SHA-256: 5d4a29fe69c2ddef93a885fd1db379f0b91d66527b077de2bf8a194878e93ef1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://robalton.es/Albums/images/file///fajav.pdf In PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/7b98cd4142d9ebb0acfe95eacfddeb94/jerisinajimozikilobudox.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c060523b948a0ed6dac42e6e9ba8ab92/moled.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c2d00f1b---totorolajujef.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/konorotarotuv.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/t1t5hdop3d1hdnk0cfkuu53djv/feviparomumiwonibi.pdfIn PDF document text
    • https://laser123.com/geektic/files/dasarivotuvimotus.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/sonuzerirojuj.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/85066639324.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/34519840736.pdfIn PDF document text
    • https://seerupit.dk/assens/file/vizukali.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/02fd6e386192a9b66adbe9db554b4fa8/levinitibavotubebesorix.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/mozewadafeda.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb1cd7ac56---29375063584.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/29437747885.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/nuwasigujesulaz.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/77284236687.pdfIn PDF document text
    • https://badrivishal.com/media/35049729241.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/romaw.pdfIn PDF document text
    • https://emprenderem.cl/files/zikozefomevipugoguwi.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/nusevowir.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/99494085164.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/gorubotuwopiwom.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tj4d2kk2kgjamrkojhdl1e31u1/bijedogo.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/lilajemezenepap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=morpheme+and+allomorph+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_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10400 bytes
SHA-256: f674ca65aed2acdaee3a5fccc9605e92eede207e5803e9f04b429316304ef8f1
font_01_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 19956 bytes
SHA-256: 8ca4c7b0e0dbebd3df54173714b18d9c2657f83184fdb102b0a1bf725ad07288

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