Malicious PDF — malware analysis report

Static analysis result for SHA-256 999bf4c5f1c2a053…

MALICIOUS

PDF

93.5 KB Created: 2021-07-01 11:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b90a497029db4b3198a101cfc5c5cbb6 SHA-1: 2cabc598e831dd16a83f25b2c989eb843d5333eb SHA-256: 999bf4c5f1c2a053b63d5cb3ece51350cd38ab2d3cd23bbf784a9a8d89de23c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating an attempt to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crysiq.ru/uplcv?utm_term=learn+to+be+a+better+person
    • http://studiomontironi.eu/userfiles/files/potazasaru.pdf
    • http://goteneplast.se/files/images/file/15499741440.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5qcsdr7nb9akdfvg1eelaavids/76351795302.pdf
    • http://asfus.net/virgsurv/userfiles/file/28152783623.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/59918374859.pdf
    • https://mecaniquekd.ca/upload/file/45210241498.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/32689304c80d65f3f2995eada20badb1/kugopazodokeki.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ueh5obdchagadulomn29f9ad65/65839936546.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89d2a32c4---mutibuzowazazoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641137f8de---46353923808.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/vogabademokadat.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5d0mlem03121lti90rbv224fo7/zutuxivogetijusakiroko.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f900a730789b04f2428689f50f08ce64/95359651506.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160940175be0a5---42756865082.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d103f38a---jemamaduvuf.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/681fd278a937277959758fee91adfa7e/94001920140.pdf
    • http://sushikyototogo.com/uploads/files/92426185829.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ef94e0368bf5ef97d23bcf72770cf01e/24844110039.pdf
    • http://446888.top/userfiles/file/32352395935.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8450c02ed9852776ffe0f892b092b84e/fojedoxotulidix.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5d0485fef---wimetunavarutanupoma.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9171060e---dexikilametiva.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/00e3d11c70a5107535bb438ef1f20d55/56759066074.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbfd90a76b---vonufubosizolukeperoro.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_off00010bb3.bin
4b8138045bf4eaaf7ec31a355258a3af1c5783c929be32a409e931ca0b75af46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 17800 bytes
font_01_sfnt_off000139e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139E9 16792 bytes
font_02_sfnt_off00015200.bin
15dc3ef3ad184865c154ee13927cef29a92983a7ef5ca8920552d66b463dc23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15200 10204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.