Malicious PDF — malware analysis report

Static analysis result for SHA-256 121f2507d3805ba4…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 06:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5d0edf3555a1541439de5c274951b0de SHA-1: c368e9923222e6774ca84547e0c4808188d964df SHA-256: 121f2507d3805ba40cd5e0ada771d75d949751e5fb13929cf84a2254b96c7a3b
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/51c2ec597b6b3aaec88fc70e9372e2b4/36543571773.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cf808a6b9---dofupumijibenewesan.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/57563723971.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1e71e8f0---tozovapiwizux.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b285bcf2612---97435230947.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/2db536f60a45da7a61957abfe91ec6b8/netanidamuxasikazi.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/97473398402.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/35817380629.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/14176675409.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bobemoneteza.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/43299954809.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1eb01b0d8d0d7caae0bbdec23c4a9fba/86007445601.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/pifulazoxodemul.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2be257dd0---91374843758.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/vonijobubunimugotetobunij.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbee1d01a49---pasilusuweremojufetar.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/44477514305.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6137df9063750d4077f458795978ac55/64354953280.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076786db0eb7---wakofuwupajofi.pdfIn PDF document text
    • http://ruresept.ru/files/file/tajatizafilozaxutalatokof.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160732ce181612---tosurawapazuzo.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/48504469850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=online+tambola+ticket+gamesPDF 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_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 17132 bytes
SHA-256: 62dd9d3ddf780763c48d0ce31dc4f64eed794c4e34fa7a73c2e0e3d9673cf72d
font_01_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 10732 bytes
SHA-256: a4e887242c7c8c6e89d3e7fdd1d206e7f6690c5460bbdc592fb078948ffea2ce
font_02_sfnt_off000137e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1