Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f9f3a381d10a86…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 13:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e69b030a74e9670c3225258ec497501 SHA-1: d49cd2f14e8be7d11ed5ca24eea6820999b12b6c SHA-256: c6f9f3a381d10a86841ea757fb2aa419ca0c824afae34bc1bbc584c96364ed40
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack pattern observed is the use of a link farm to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://labonguyenhoang.com/img-chamthi/files/tapazuruvavuregakol.pdf In PDF document text
    • https://pointvirgule.ca/upload/editor/file/75206689275.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/37973a81f327d9038d3cc053cbabd20b/jegudifajogugedixim.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/tq751ndkadbphagfvo4jg61t5t/79880362167.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/88546080059.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee99eb8a7---tatodimewulejene.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/77bf6ef15c8d0879af47e5d0aaa678ba/pevotijakofabopetegapusa.pdfIn PDF document text
    • http://feg.vn/uploads/files/zosorawedumod.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54bed9bc36---xuzetimemi.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vupelizixibaf.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/57537000151.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/kaverofenixeb.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/famalulele.pdfIn PDF document text
    • http://edgecs.net/documents/10381740303.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/34568619784.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba06abd615---20267881763.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/78194593065.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/giwosidirivejojuwesa.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/boxegavapulunesox.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9aad522a6---jureza.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/17702079315.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8ebbp34fb2874f7hepgqsl88pk/77437362451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=100+examples+of+synonyms+with+sentences+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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 11164 bytes
SHA-256: 85b63b809dc038acab7149a1afa6972fe91968ce12d5cb39d90592dc798c9c46
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 17384 bytes
SHA-256: 1c2b00310aaba03ee8f08e59cc7f5343f38d8571ed591e4e36410e3573bda366
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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