Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b2672a3e3aa13b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 20:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44de053ee21ad44bbaeda44a813b6b35 SHA-1: 1f0cb684ded9d88f211b7c452e790cdd1931f645 SHA-256: 57b2672a3e3aa13b7ea65355479b9c19077b2605e3c4fb9ee90538e386ba6f49
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and a compromised CMS upload link suggests an attempt to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marljivo.hr/UserFiles/files/molezonugawipexor.pdf In PDF document text
    • http://upoart.com/ckfinder/userfiles/files/lufasixamulunavolano.pdfIn PDF document text
    • https://reha.bg/content/upload/file/leruxufabosolopesokotov.pdfIn PDF document text
    • https://photofetimages.com/bigodalu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wurek.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/80768647057.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608338c595a8f---babuferagapigikixipitegev.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/44b8d900dfc574dc93541d08fcf12c97/tokijo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9b0c6c48---rerubezupipeni.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/828vs875t5q1ehq8s087cidd99/91982535633.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb49ce4bdf---vusavedoratesiwatepum.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d013aca92---ruzageworikewekugaxiw.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244a0c29cc---garujinizuzep.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c7d3e652000d67aadcfbe206fe78628a/76195115137.pdfIn PDF document text
    • http://fotossc.pl/_files/file/52153744757.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/23228488199.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d9e427bc9887a6cb1b4ad7dbe69b229e/12718204756.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/saminodojup.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121700d61703---95354412888.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/95344645331.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4a0df508---75519751593.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/29843795907.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/tadogo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6tlrbpgv3rihgch5dqbmpkvu35/zipese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+pump+for+waterPDF 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_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 15844 bytes
SHA-256: a221d3af0f6fdb107e6975974312dacd4e264e7bec90539851cd31b00a08a40e
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 10436 bytes
SHA-256: 16c2ff24118effb7c3f31b91a93f2704a9debbc90e1ac11115f9daa17ac5508f

Open this report in the interactive analyzer, or submit your own file for analysis.