Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7165ce2993fee90…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 10:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 293b4c4507107f40d084c3495d94ceb9 SHA-1: a316511b9f777613937b73b1d3b59e92b7caca35 SHA-256: c7165ce2993fee905f37a39361e347dd5ea02aadbec9fe81879f5f0ea7d6b3c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a callback lure heuristic further supports a phishing or scamming intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://agriplan-rs.com/dados/ckfinder/files/53940970997.pdf In PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/7045602977.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/91012081842.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/7577922134.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/90977891471.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/28654495893.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613635dff013e---sajobasusi.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/repananon.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/13fadc53afaba33a14382234e870c478/wiwidekovibipebuxudeb.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ginupili.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/nuduzazaf.pdfIn PDF document text
    • http://martonelektro.hu/files/file/37045876623.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161416c913cd2a---46361891171.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614111bb9c995---57413080462.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/xogezofezorusidirod.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/muzomogemukag.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e37f613f7e---74814876311.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/kekepijafavi.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/89882812510.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/12761032720.pdfIn PDF document text
    • http://szhlfz.net/upload/wufilipizodeperalevipiv.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007e246544---dekafozurukigakonefiv.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/80257932562.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/ririr.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/misebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dls+coins+2019PDF 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_off0000bd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 16220 bytes
SHA-256: f27a610568c1b58967b69f31dd45562bae15d71865f4119114142a9ae248fd9b
font_01_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10192 bytes
SHA-256: 942c6bc5ef692ef3b95ada49985f180eed3969bae2c2f0ebc0c1ebefe6960369

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