Malicious PDF — malware analysis report

Static analysis result for SHA-256 501891060e0cbb95…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 10:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3bd15e259f1db67ae721d3a80ef365c4 SHA-1: 4b466055fca2adad56cb35da97eaa7385440eb18 SHA-256: 501891060e0cbb9512c0e3a5e8d56e89621a8668c48106fd3ed99bc77702efbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs structured as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to host phishing pages or malware. The presence of 'utm_term=supercharged+javascript+graphics+pdf' in one URL suggests an attempt to disguise the malicious nature of the link.

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://irlanc.ru/uplcv?utm_term=supercharged+javascript+graphics+pdf PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614836536f61f---xamegu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rihnfnm1vjj24a92noub9r5o72/lalubukusoz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e0edd6d8ccf71efcd61c7f175fd77357/50878216024.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fofekamaletamobiro.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/wipaxoze.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea46372898---94946343961.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/legasax.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/24081179050.pdfIn PDF document text
    • https://tivicom.vn/upload/files/jokodewosazajufepafaw.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/45841119303.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/7178202917.pdfIn PDF document text
    • http://creationart.hu/files/file/sufapomigenameliku.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/logibibilotevebenuni.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/pekukilaximiwokog.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/83509292084.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/pinewurumewimowopasuv.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/28190209911.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f9580g6ii75r1thth3b38q0ar4/razojevaremoba.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/fupowusadovo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qmrdfsagrq0056ig5tb4fafoc3/damuzojavumub.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/pafapijoz.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/monaxosajekorajuvarofe.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/zuwuzaralurologujofokev.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/62272878521.pdfIn PDF document text
    • 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_off0000b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 11000 bytes
SHA-256: a08f71857471a6be2622c00968ec37000c82c437637dcb017e33ddfb6f0db800
font_02_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 15896 bytes
SHA-256: 8d9496bfe5875351e4e899b885f85219dd9d60cfffcd775bd5e43f805b203cc6

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