Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda0dbf1e14d2e79…

MALICIOUS

PDF

87.0 KB Created: 2021-07-28 07:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f60dcf536594a39e5bd41239f6db0ee6 SHA-1: 83cffb7a9a1712bbf5cdb013d719c7aaf6119230 SHA-256: cda0dbf1e14d2e79326d0388853aee615a0786e777e261423c5577f6be7b705a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160721d5e67aaf---medekubomisowagikaven.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1462815615---tagewebawus.pdfIn PDF document text
    • http://aimic.com/userfiles/file/zitil.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/70155101501.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wusodukawamawezexofa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6fffd7b32---kuvizobupu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0b9ddacc8---besupononovivopipelunevo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1841e601c---kekuwiwebegoxigiwo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ed0a4bca57624b40d4b018a195f58a02/jupekesegez.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/guludosajimipojig.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/88178936805.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/lowizadetasita.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/xonuvenikevenesob.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/dajunuvodagulugusiv.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/67b49e7c8131bc9d0aa30b334f378926/85174595286.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c87de54ec969b04a4abbe3a0139480ed/valopezebusavasodoni.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/95924885533.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c659fbe3bd0---24058369720.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160e11b25d3b33---pevupulalemobuzipow.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rp6m11fecc8jq7d9bj516nc8t6/xetaw.pdfIn PDF document text
    • http://huiking.cn/uploads/file/200016252213.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/8737421917f67cefbb8db6bf808f02d8/sibumabadoketewexivotojeb.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6f26571f---31976950500.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/97699305988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+printable+home+inspection+checklist+for+buyers+pdfPDF 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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 11308 bytes
SHA-256: 3697199dcd2fd52e3ee81029330b5cd2ee5e6368d4190431517740314f31f190
font_01_sfnt_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 16904 bytes
SHA-256: a871beb5cd7dff665edcdf99bc4e156093949fbfbcd54eb593c603d9b83dd3af
font_02_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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