Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86f96bfd90d34ac…

MALICIOUS

PDF

90.9 KB Created: 2021-07-26 10:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a825cfb75d896ae8df75dcc925e24c0a SHA-1: fed1d49d2be01ac4e05760a16181cc55783bdc2e SHA-256: a86f96bfd90d34ac7df321a1bacb6c37333dff87e8ee32c22f66a325d4e9b95a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm suggests it is designed to lead users to malicious sites, likely for phishing or malware delivery, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/37452def2b543ee029244195a967f19b/57261267423.pdf In PDF document text
    • http://jsushibrea.com/uploads/files/39046106676.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/kupudukexivusi.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/molivagibelogixe.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/bekalijajetenej.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cca4fa14623---28158303488.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3bf6a92c04a6b083293da6628b4ec3a1/bukafimokijuzimopadudine.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/kotibikarurumabe.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd718d43ce---komapawaterezujefod.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tdfpojv6sl46q57m5uifq2pb8a/bekuzulebogikokebidoxerun.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccd82e160---sulolexotuniwewex.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/dfcaf36968ba633200e6c8b79ce33237/solomedorubefetezoteduji.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/15807952310.pdfIn PDF document text
    • http://canadanur.com/resimler/files/13487030667.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/laradebubajafibexaruviv.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/33257057211.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7817c596ae6cefd50520a81fb4f4803/jobifizedoro.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/14332941121.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gijho82m3lhoqgpul3v9r1rth4/43762624568.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160841b5998754---37708902239.pdfIn PDF document text
    • http://ud2-140.com/files/bekapezegoxipote.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/q5dt436p55bml2i86p27rqee74/zixulokapuje.pdfIn PDF document text
    • http://splogservice.ru/content/file/satadagojofotosomixizotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ingredientes+de+pizza+italiana+originalPDF 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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 19560 bytes
SHA-256: cc0eac8d3d3507b0b97f594d1eea1072a0364217db5575fb6e6c2e671888ee90
font_01_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001440b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440B 10580 bytes
SHA-256: b0e583d01bab61d8a5fd487f7d7930de612a355f3033a5ef282dd90839d66f8b