Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ac0b8afd65fdc0…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 18:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 209d68508f671c1e2ac53ca68b7d4460 SHA-1: 12a594d6b5ff5aa6ecebca9bdb4791e6b3ab8111 SHA-256: 64ac0b8afd65fdc0d8d05baa921cf6251b03422692f24962681c675b24c6f0ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some URLs hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware, hence the classification as Spearphishing Attachment.

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 http://patronusalapitvany.hu/public_html/upload/82334906112.pdf In PDF document text
    • http://tsmsaldature.it/userfiles/files/52604650584.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/siwixibog.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/memab.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaea06ae15---niwejerumi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257921f1307---verivavozinatolaruw.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/m7q4qgvriil60odvq1lgccfgd5/41215730699.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/ziwuxunarinotemezoni.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/65186322249.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/suxulezotaruzanofix.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2502e35ff9ec1f7d895e61d0e1e8b7b3/risodiluxob.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/36475194321.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qie31eh0jjg7lg95dhk9033uco/91658888312.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a615981b---texasinasutitaxedibifub.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd849172c5---50155542346.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/kiditemapafezatinite.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nowuxolerezimuwijoz.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mowaputasipirovitaxij.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m2q13o4rom0lkpftsd63ta6doe/53465696806.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/48996650997.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/wogidoganak.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/dalavevoxerovogafoga.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/1hai6p48om9h3j1tl9e00acd02/kuwuvopaxesikaxowuza.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb7bda613---vezisasidovegiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=b+d+chaurasia+general+anatomy+sixth+edition+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_off0000c5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 17544 bytes
SHA-256: ee43b8f860fc1dc7dbbe6ae239ab9df1d07e2bcfa193ab6d63ef4d07c1627ff5
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 11436 bytes
SHA-256: 95a4b8d05e35aa851819d041b99e77d8ee6d98c4b7c63e4a556a6fe0f1d4f96d
font_02_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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