Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d89f1ced801862…

MALICIOUS

PDF

145.7 KB Created: 2021-08-12 20:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38e85f0b35b4b38160c7a60a414ec08d SHA-1: 5ff557e7f767cf90322c04d09897a06b4733154e SHA-256: d3d89f1ced8018621fa0366abaf641fbec8c81f7caec0de4cbe0fbd648be4f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a075d69be---90026370505.pdf In PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/1d2fc94a56881d862811f4dda450eb6d/21050480574.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609092bf21dcc---82180308902.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/97213815883.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fizifapuwoj.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/wawuladosepubevig.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0f139f51---futidumux.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30f6e7889---vuwuradiwixapezonukeleleb.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210614_232426.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/jelasuvojul.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/rilunupemokibop.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/fiwenexebuxitiridalumujaz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/52156894356e7eb30d999887718e4ef3/sexisunimiguxonitokexu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/884221a0072c812e92f58c4aadd3fbfc/54275827334.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/79085276438.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuperikegodil.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o6ijie61fvh4trct9j3mgs3km3/5014343754.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa16a29d7a4---38941977118.pdfIn PDF document text
    • http://napiarsaigh.com/images/nokilutu.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/xexuzavo.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/bazenogixoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+transcribe+dna+to+mrna+examplePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3ffdc659cea99949101b40875aea9c4/tekukunikekubugonewe.pdfIn PDF document text
    • 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_off0001d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F052 17376 bytes
SHA-256: 309f468107c29ef4a83cf205abeb19c2a3fc3421ba88a744b9a29c717358c76d
font_02_sfnt_off00021e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E3D 10992 bytes
SHA-256: cf312f32d18eb4ad1ba84c113f3507ac2943a127468f883b53f11ad12e00b158

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