Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef32744e7a58ac…

MALICIOUS

PDF

91.3 KB Created: 2021-08-13 15:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed047b348267388e85e3f0ed6c38c9f0 SHA-1: 08d8d09759b3e45edafc52461ac7a8bc5c270c35 SHA-256: ddef32744e7a58ac1b1d305a3bfd39a62bf19a72453dede844a8fe47445c16f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a167aadc730---sudatepinine.pdf In PDF document text
    • http://daikinhbac.com/upload/files/42487016963.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f08b6444---84666371515.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/711c4ed4e8de23a68a79f51d49c307d7/zosagajisirazumimixirofez.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/4153962267.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/95709793678.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/73291651424.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/xakes.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d39dbbd83c8bbf4ef356b975f7c1f819/1590510162.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/98517534965.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe3f28204---kitabu.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/bigesatad.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0dek431acc0opufa77tfoo7927/54797456043.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/79880361360.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6d7a9b64c---xufisifupaposegamilugutod.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/66larqumgkjso4f8chu2ut9ndj/rokuverireposukenajagumi.pdfIn PDF document text
    • https://dineflon.com//files/lixajagasolatuveseru.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/55111744163.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kizatizuzakofixitex.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160844b7db1d8f---rarukadasaz.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/79110544678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=standard+normal+distribution+table+to+find+z+scorePDF 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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 18420 bytes
SHA-256: ca3be86c0782c67ba07ea3b350bc06cc6dacafd39cb38fbab7569a89064a6e64
font_01_sfnt_off00012b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 11012 bytes
SHA-256: c8f7a4a87ed836a1ae670fc909000c962f209ebb8697194438209e68b4356ce8
font_02_sfnt_off000144c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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