Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa7a02c49a20974…

MALICIOUS

PDF

85.1 KB Created: 2021-08-10 13:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eb8613de67ed19779eedd28ca843c76 SHA-1: 37ca3e0dbbeeaca1dbf05d2a2eda76e8e0e1995e SHA-256: dfa7a02c49a2097457eaed81f9c66a59dac13031eb2ff876296ac0de6cfecaf8
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 compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these redirects. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://istihdamhaberleri.com/upload/ckfinder/files/xixusoxa.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052615015093.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9d066b15---59286152305.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/38096219718.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbf7188683---sibelofiwafute.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043ce411441---52563270158.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/16c9ca237661cbc036c4404be1e951e9/sakixewegaxon.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/susemokiwusasekikewaxu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/jizojijasavarusekavodomu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/nugifuroxeninun.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/51578076524.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/71988090521.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160766fb1e9292---gotomopekak.pdfIn PDF document text
    • http://ccsl.asia/files/33976053890.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/fedilabarawanezoladibabi.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/45907197875.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2f51ae918b3275feeb55e9816a7e79d7/33199023703.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9171cb777c8a81c38aeaa57d79f19e1a/niziwupibuso.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d262a42961---resiloronemuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=invitaciones+de+unicornio+para+editar+gratis+onlinePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4e48a94050873342ed3c18c84d57a182/73145055065.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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 17984 bytes
SHA-256: 30fe9171e8d1b2e357106a4ef5f2a25863550c96a637bea35309425420aa3890
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 10808 bytes
SHA-256: 1aa6bdb779308a65f2ce0d3e988626be70ef77a0c4d93205a7d929da55ae2d1f
font_02_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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