Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60a79d11e56b8c0…

MALICIOUS

PDF

92.2 KB Created: 2021-09-13 18:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4c3f16e15465d75dddde4a6ea4b8ce6 SHA-1: 2faf5c739d8aaa59d4d577e7fc730839f7a94e77 SHA-256: a60a79d11e56b8c0c63559032c2ce5a13ba6ad5379d7fd351ad3f1e79e62b8df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=interstella+5555+hd+1080p+online PDF link annotation
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/tufolebiforijezijuzezo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281b9893af---62611510123.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/zekotadusujisu.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/ratukurojijugoni.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109090128535615.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613706b722f5c---zefivadejekazogixaguvuzo.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/41984799256.pdfIn PDF document text
    • https://123natura.com/stockages/files/riwajuxokit.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/zizonepisexisuni.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911072919_OTUwMzU0NDcxNzI=.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368cc99bbf2---zuzizavanapowogodezak.pdfIn PDF document text
    • http://venkateshservices.com/uploads/11977736376.pdfIn PDF document text
    • https://upaspor.com/resimler/files/30606280740.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/lujixopepipetanuru.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/laxobevivumovo.pdfIn PDF document text
    • https://highrise.pl/file/jobupo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8dfbdb91---53617014035.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/8280667177.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/38380379437.pdfIn PDF document text
    • http://paliukenas.lt/i/File/kugevalag.pdfIn PDF document text
    • http://www.grifin.sk/files/ketisobejimazow.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090710251270554.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/28157951894.pdfIn PDF document text
    • https://ka-base.no/images_content/file/62320193363.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/89996584643.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_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 20152 bytes
SHA-256: 2635287b4a0423ddc7e6120b0a8fe891ea0879ac66c25d3b9bc1a5cd6e12ff55
font_01_sfnt_off0001328c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328C 10956 bytes
SHA-256: d0315971f746b5407c396d1b4246d46a6c7a763fafc7f01d80e63726bd87b99d
font_02_sfnt_off00014bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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