Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d3356703493f69…

MALICIOUS

PDF

88.4 KB Created: 2021-08-31 06:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb1a5d7b9386e858b0a2262a5dbb4dfb SHA-1: 44b2070ea5f76032126ee91d3e4516cc83e433c8 SHA-256: f0d3356703493f6918e9e6173d1267a88f760c230d90cd2fa7035c78c122bdee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=dairy+industry+in+india+2019+pdf PDF link annotation
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f481d395d1f45890a2da3fb5332e337c/xotopiwerozemosedogab.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2561523ff1311035195bddea8b09b395/boloroziluxi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dg1booq8efhj9vsbgcpfopdsru/95843335169.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f854828785---lesatakujonitexalepela.pdfIn PDF document text
    • http://hongdacable.com/d/files/segenuzulazefi.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gasod.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/15406cd47d61939ba294c4abd24a42d1/20733126138.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/gorudedebimibegube.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de18615996a---vawaredowepuwijewopur.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fb58afe03---xufapinudusuv.pdfIn PDF document text
    • http://charivne.info/images/file/polevebuluriwot.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/68161328218.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b34a584f31fe423aad14e73f82c18461/29996479376.pdfIn PDF document text
    • http://livestocktool.com/d/files/68330748420.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161123f17edeb1---98860947530.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b08d1959012c67e87bce6ef04875ce81/80287919041.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833e4290173---6759707873.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/38727109659.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/17369346809.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/zubinabi.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/bibidogenenugoga.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/vroepr7bquqfregh8i1rpvh9dt/jafasa.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/35457756888.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_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 18392 bytes
SHA-256: 21830264e7a90fb75d098640a0c60c145a24ddd8a97cdb79075eda562f7b5835
font_01_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 10872 bytes
SHA-256: d22462f31b0d727a6a156c3df6de77db3ab7ae1a785fa3c18dd744cd51df73ae

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