Malicious PDF — malware analysis report

Static analysis result for SHA-256 164566b785ab0591…

MALICIOUS

PDF

81.1 KB Created: 2021-08-29 07:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2affe3e490d820dd2660f18cad01baf SHA-1: eb619731ce35127bc81a8088c752ed93a72edb5c SHA-256: 164566b785ab0591fc2217650caed6cbdf7cc7eb4d484612b60f05495067c976
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised CMS upload locations and disposable hosting. These elements suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=the+age+of+access+pdf PDF link annotation
    • http://alumcity.ru/userfiles/file/mixowilukamesud.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e84a7d3d7---15842078651.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeecf34700---45628515076.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/bigabupodafejaj.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/has5qpl3cjaglprkvqec0673p3/sotem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d663616---bamakodafowazosev.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074544165ccb---76635086528.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/536697992.pdfIn PDF document text
    • http://www.centralperdana.com/file/busipodititubudef.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lesogodegibinuvanuda.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/27414218340.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/76807918552.pdfIn PDF document text
    • http://finatwork.com/userfiles/file/41231604044.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sapuzekinifut.pdfIn PDF document text
    • http://bulmarconsult.com/files/50017324562.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/140acb99e061e89b9b34db0f397c6c3b/22750348970.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/fesenodiraxubewikoru.pdfIn PDF document text
    • http://hydrem.ru/images/file/volafulemisugexaxuniduf.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/linena.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/6791854198.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079eba9c68e0---98765672194.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/11/24051696170.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/baf1cbfc3fcf8e106794e5271e251cc7/63102531644.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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 18068 bytes
SHA-256: 49975f1f5ab815d6949e99965056bbaf2b5a822e859674dbf03ad30000f6b229
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 10420 bytes
SHA-256: fffe9f20a095e3d081f479c7194c8ebd6ee9f0181e18ab1b1843c6214a016f53

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