Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ae9860cdcfeabd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 23:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb26591520f6283fad56fb3f316858c7 SHA-1: f26400452d9d0b0cad4dd0b4ae5ecfb9d2f42a51 SHA-256: 08ae9860cdcfeabd8c5e56ac75bfc45b974490182e38ec562dff2ffbc8710a48
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nusamulticentralestari.com/Uploads/userfiles/files/junanukowaviwonix.pdf In PDF document text
    • https://jin-hung.com/userfiles/file/88385081062.pdfIn PDF document text
    • https://dellrein.ru/content/file/tulisevulizufe.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/kenuj.pdfIn PDF document text
    • https://profesa.net/userFilesfile/zolurawi.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/2784327009.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130decdbb0a7---tatomunu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909000743504431.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/gizezinakekuline.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/perufamatupaxajivujuzabil.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/zozazexazuresemetanurifi.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/nafijiwafaxusovovomu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/89358451702.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/nedutizaduvogejuxam.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/96184070.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/bimimakunome.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce5407fc6---15385242482.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/judinosumejigazilejizuzej.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed88fb940a---79204828645.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/vobatuwojaxekufevun.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210902060441.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f633086a---12212792265.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/6260624354.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc53ac3df---39216841574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mmi+code+androidPDF 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_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10212 bytes
SHA-256: 33691cc1004e02bbeb249c3a3b6a42e3262e838ea2c25b35c3fb7077652c8b45
font_02_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 18008 bytes
SHA-256: 23ad8810b82a0ab4ccc58e62c9411637a81f42efe45026f8d3fc416ccef616bc

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