Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aa1ce71c151272…

MALICIOUS

PDF

77.2 KB Created: 2021-06-20 18:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4662429513eeb5422becd1a0d9f9594 SHA-1: 5b96c71e53ac299e289c24f7fdb8adb4c2ccb728 SHA-256: f9aa1ce71c15127275fd1674a4d898f88f9979d33e7b665243b03e3cd76c6a56
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The document body, though heavily obfuscated, suggests a lure for 'geunu athithaya mp3 download', indicating a potential phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=geunu+athithaya+mp3+download
    • http://www.lugashotel.com/data/editorfile/vifuk.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b47aa63a---31569168939.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a7cf1db7a7f87e4560fb790e9a2e2ffb/totagazatotesominoxuxobip.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210620122649.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/900b2b781c59d7f853897580d625c0da/navejigugefisuvikadelopex.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/visewitoziwafuloteki.pdf
    • https://cloud-tutors.com/wp-content/plugins/super-forms/uploads/php/files/49de98d1534baa1ac17d435316eabebb/53434682641.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8436edbab9---16781424531.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8091fa83bd8fc2c35f1cf218748a3b13/55773257229.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792c93d0034---fijejiluni.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412468bcfd---mimusil.pdf
    • https://alamansyria.com/userfiles/file/kexanogubezujuw.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609858878466a---jizova.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9pu54beeumgkkp05155789329h/77626050431.pdf
    • https://isosklo.cz./uploads/83635806746.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff49bc72d3---82050519466.pdf
    • http://stevis.cz/files/file/dusigurativujimupabevuwen.pdf
    • http://absolutelyneon.com/userfiles/file/21197188114.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/6290758974.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e276.bin
450e8521e4444c57af5fb164d9ef939f587715833aad37636d3da0f436b15a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 5196 bytes
font_01_sfnt_off0000f417.bin
9bdea9e4b7ffbfcf4ddac853115fde3aee6b4220c3274ddcf255cea4c34b4fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 11104 bytes
font_02_sfnt_off00011986.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 4324 bytes

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