Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba99f55f6d65c762…

MALICIOUS

PDF

77.9 KB Created: 2021-08-26 08:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96ccc8955faa6ba5f80adabbc33c9ca6 SHA-1: fc18122fbf993603d023da9cb5c6746f1bc1ae79 SHA-256: ba99f55f6d65c762c12202de7145c13f7ebdddfa3e4cff7710688a40bc965a80
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains multiple heuristics indicating it's a link farm, with several URIs pointing to potentially compromised CMS uploads or disposable hosting. One URI uses a raw IP address, suggesting an attempt to obscure the true destination. The primary attack pattern involves luring users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5eae2f571---fipesiwagawaj.pdf In PDF document text
    • http://imosa.asia/uploads/files/202108261203136388.pdfIn PDF document text
    • https://ottopianos.nl/files/24812818046.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9c335223---51539637130.pdfIn PDF document text
    • http://cycling-software.com/files/file/wewuvuxadux.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/33248630661.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/mewodesejewakukijav.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/65236742032.pdfPDF link annotation
    • https://shinko-tw.com/UserFiles/file/fularipekolapovazunasuk.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/19655727275.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609da1b4046f4---77480753587.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/866989f6c45fba883eff6a6312a542c8/63456792215.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/voledevadizileva.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/80530950069.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/75450574343.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607864c567d26---38286641961.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/bebiwux.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/16266431485.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/47322277575.pdfIn PDF document text
    • http://houselandia.ru/files/vasuwawijuxawamewogo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e64a1c6ce6d56d6b060e0d3754ff99a4/92248897791.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/1134943558.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/76085395496.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/nusiwagemuxufipajizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+science+of+interstellar+pdf+downloadPDF 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_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 10768 bytes
SHA-256: 49769fbce1cdbb5b4e0b37d06e7c0623d76b2576a6f12e9f591d4673dbefb615
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 16792 bytes
SHA-256: c8b820a1e5d473f32b304ae1c7a57008d808ef927654677e1f427a4fe925569a

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