Malicious PDF — malware analysis report

Static analysis result for SHA-256 20358c529f6fe15c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-09 13:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8a0fa298a017075e85a6d963ae6e76b SHA-1: 386fe075d71eec6da5c1e942b41d69681c65cd5d SHA-256: 20358c529f6fe15c348b4f0d858a81fbe8951bf1dcea454585dcd5cea308a3a1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites and acting as a link farm. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine rankings or distribute further malicious content. No scripts were extracted, but the overall pattern of linking to external PDFs is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kanalprofi.at/UserFiles/file/55275219274.pdf
    • http://dragoniresorts.com/userfiles/76666625196.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/s1vud32gc13fogj0k1n23lhqs6/88284044482.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826df3f1523---sorevopimoniva.pdf
    • http://innotack.com/userfiles/files/vazam.pdf
    • http://kccmaul.com/files/files/ginerebisazuwuvinazovoxa.pdf
    • http://adria-ex.com/images/blog//file/gojeg.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4ef30ad134a65487b6d9858cc1135fc8/kakewaruporaxefiwaf.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3de4ac2a8---zozikufawusakeriwar.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1abc85ee28f9109eaf1185d950a321db/wuvovugikuvi.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4a85c665199ed5aedd9b1ec8a6ef1c3d/fuwar.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8e49i3i48gq0tqqie1mm1hurtk/zabizenubodedax.pdf
    • http://murasakijr.com/uploads/files/zuborunujukuj.pdf
    • http://mobydick-band.de/fckdata/file/47397603723.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8c35417e---guzovomig.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8cf07063d5ba1927826a5a167a093393/rozozotijaluzamuvisida.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7fsl743fk8bj1pbh26geg7ivmu/44825027471.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8fda0c5bec1e8de40e3ae6835231cf43/badifudakojokuzo.pdf
    • https://mabuksusu.com/contents//files/kimiwiwemi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/de19d8a7c62a2297ee62382a8a8ef184/gaxewogifivebonopig.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8l981rf9e4ihcf4o1s53r9gf63/48648612683.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/xavikawapefusesajud.pdf
    • https://alihuata.com/userfiles/file/63683895491.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/tapezilawudazupadenito.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1b9ee0d27ee08c6b32b104774a09bfad/bireputifew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=chemistry+ionic+compounds+polyatomic+ions
    • 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_off0000f5e4.bin
c23ae5e42137c42f29377cbd73d43253164adb8daa52f30579b12fd6eb173a91
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 11024 bytes
font_01_sfnt_off00010f5e.bin
0a2ccd0c46c8e840fb40b01758ece47d04efcfa4b6d89dda1483b242753eef3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 17148 bytes
font_02_sfnt_off00013b29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 16792 bytes