Malicious PDF — malware analysis report

Static analysis result for SHA-256 073cc81ae05d5c93…

MALICIOUS

PDF

90.8 KB Created: 2021-07-23 08:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7b13960e3eaba79f07ccad5164ae110 SHA-1: b1e5978f6a72639f829429688cbb68f070d896ce SHA-256: 073cc81ae05d5c9376aaf0a73af6bd08dd6b6a1d739fd04eca432a667731a9fc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/17745824546.pdf In PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/mapupowilezapoli.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee00d31ecd2---tawekoluzoxikelipaje.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/jebezigegatebireju.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973cb4e5f0b---jolamu.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/67274044034.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d8e7947f8---73636319820.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kekus.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086408adc298---sevixifivotojujiragukira.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7fcb0fef---dugomadapojemej.pdfIn PDF document text
    • http://siembra.me/uploads/files/vojafatofiwibolazusop.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81066f27ab---22564103434.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/duweradowepesazofisebe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083416445d0f---tinubezalikegidi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f54cdcb8d16---45685299991.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/s1t1vqkult5gk9rmhaj8dohu54/zaraguwatez.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/14542160455.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/88952429419.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/de7118a545dc788568a3c23429b60441/2663265533.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/ketidaxerosufubazugo.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/70395663359.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076084e16dcf---basukulaju.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/96480486385.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86092da7aa---wipazepup.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9594e32664---kosinajemupadutomogojiwux.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///wosojonolewegagadoraxepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=thomas+calculus+answersPDF 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_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 17640 bytes
SHA-256: f798be9c18d3176cf5f9ecaa6284f2f95332d58477fb386a94800b0c506c04f9
font_01_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A9 10452 bytes
SHA-256: c83ee456763dd5507b751001f3cf90d803dc590fe58d131690ddecf0e55607ba