Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd86076377557f9…

MALICIOUS

PDF

100.6 KB Created: 2021-06-26 04:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50035aca9bb4ab4c770b81328b943bab SHA-1: 98f0b155d16ce2da303728fe974c4b00c092cf7a SHA-256: 9bd86076377557f9eb664ac35fafe61e49edd4f54e2d316486d10d3d92b07c87
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly identified this PDF as malicious, and the heuristics suggest it's designed to redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of suspicious URLs points to a high likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://laborke.ru/uplcv?utm_term=square+root+of+11236+by+long+division+method
    • http://albertopizzetti.it/userfiles/files/95037050520.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39fc34304---mozefujuladopegoz.pdf
    • http://acpiindia.com/userfiles/file/zotekefemuvanov.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160add7202a8f7---55130219418.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b0b7c1e8---39046998148.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/61431015246.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/705df071abb5f9d5a8d4ef5d9709be93/risuzumekosobisoxona.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u504pl9oro5fvm7m1t8b0peiu5/gagakozasitejexumepurak.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/009b710af3143a7eba14e2efe3c7817b/tijobodadopan.pdf
    • http://historia-bfured.hu/userfiles/file/9751847870.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609993ec83ed1---tajeguzapalaxa.pdf
    • http://helloshoppingnepal.com/userfiles/file/todizarevox.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/58d1d3ab177f643a8e739a6e91332c1e/bikadidulotolugoma.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/616516c2424154e564ee3762da9f23cf/69606435122.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ee3bfc93---634922342.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34ba0a428c---52595660167.pdf
    • http://studiogaleazzo.eu/userfiles/files/nupuredipivapulireno.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/168bdf96572db6e92a5c957d15721495/vinufutujufirilexorutute.pdf
    • http://mini-garden.ru/userfiles/file/nibimupatadolika.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4092a599---46342461116.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d74ff57da8dcefbc43b03dc6d25b4e27/36325255476.pdf
    • http://jedwines.com/cmsCart//upload/file/vawenenefopof.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d628188c92d2d5beff32651c0c3a6cc9/31809417939.pdf
    • http://kgmda.com/upload/files/76154312061.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f68eecf---65453956543.pdf
    • 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_off000125be.bin
d109b72ca671aa664323ab3ec6e81266b722a27bc14979037f8993efc0066783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16504 bytes
font_01_sfnt_off00015089.bin
ffe22805ee1fb17959701f84cc7229a6f8a6cc09a2da3ef519750c93dc41853e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15089 11956 bytes
font_02_sfnt_off00016cba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBA 16792 bytes

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