Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e6fa78676b77e…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 20:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26c3ff3ab1fa1c1a31801f82c6e5dc1f SHA-1: 9bdf2a0d33c47ce8e4096ec83d787fd1c0ae2b57 SHA-256: 873e6fa78676b77e25f320d864d6b25835d72a1b3ffebcc93d26eb40bdbba0ea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/753bb3d4ab9d7bdbd05c0d40f9081bec/66311675862.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca98335c1e---noperokurenotonufilawo.pdf
    • http://engroupe.ca/aym_image/files/84265508318.pdf
    • http://euredit-editions.com/userfiles/file/fizifoxikidixelotiroget.pdf
    • http://fitviewer.biz/files/file/22679334272.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0b5872ceef368491ae3e5b42f13bc4e6/90700648284.pdf
    • http://xaydungphongphu.com/uploads/files/17649963511.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b144e9ccc22---tatuxewamixozosed.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/00a04e42025984d3982ab8b0816dc6d2/sibiruvifukewemupimofafu.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/70789226769.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c905a8bf---62632436396.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/dd571eba88cd20ed2226c67f24a585bf/51248041337.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/cc8o45ta461ofhq3lksc9d5v14/nofusifozake.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d3f0df45f464ddd5ee24c22ed9a7d925/29040455697.pdf
    • https://lienlacanien.com/img_pages/file/rugomi.pdf
    • https://studiovizia.com/webroot/img/content/files/18434962837.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dc2f07ac3c0feecd7f836f4775dcb70a/18019997334.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/18f9db6560e77452f0f5338eb8721641/tepotewuwuvipevavas.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b47c506dd---46019770200.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d731508f---viwotas.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9f766c24---jeviliwufepefupav.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a353ad04f79---65663984044.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bb4d6e43c16b34b6854ac92dabc26bce/52708220378.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+word+of+god+is+mighty+to+the+pulling+down+of+strongholds
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
font_01_sfnt_off0001035e.bin
a7d2e0d3e712340bd0e42cd7196a24685452cb5e95029052b60bf69bd446bb8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 17268 bytes
font_02_sfnt_off00012fb3.bin
57feee512a9cb0e2e9a524867227cd991c6d7a6558256a7f65d2b95a91fe5bcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 11048 bytes