Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb275bd553e4bfb8…

MALICIOUS

PDF

80.1 KB Created: 2021-06-27 09:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e3d74220457d985701750bc59c5f5ff SHA-1: 65b307c0b130c82eaf24931af0d6cff23799fece SHA-256: eb275bd553e4bfb8018f5cd887c9d52067fac19fb961744d4d14a6a6aa627935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. Although no scripts were extracted, the presence of multiple external URIs and the high confidence scores from detection engines indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=ovaria+from+lamelle
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/45748bfcc548bac21150f76abe0204c0/52310090905.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077faa561aad---81156445207.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tneuga55i1brj8ips7e9pakpbd/gasoluxoni.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bf33bcdb3f9c04173dd831ae21202939/93621136.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e224314f8bd370d572f9229fe9487553/keziluxo.pdf
    • https://banghenails.com/upload/file/28435045012.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab15407d4---71582504586.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c23f498b8---73738063318.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/6fqhro63k459k96nafstmt3pmp/wupolipezujakuzate.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab2c2ce5c7---62531941606.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afff5e60ab1---mubenexavarepanimar.pdf
    • https://digireg.se/upload/disoredifobi.pdf
    • https://ajitcoatings.com/uploads/77792063477.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d38c4985220aa81323de610dd29febb8/pibexafusufofevas.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3a5b8c3a620a9f017df068865f06d2f8/40772908215.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add301e70a---xixafamoxubunebazasow.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b008866ec97---kelorigapowarorifofikik.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/525e9b3a9eaad5fdbd86059c7792f513/80479732849.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/sjuduuvdng4ciac2q5h4cvjbv6/95542609838.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69b883919---widirovefifemixuxevubo.pdf
    • https://asthasupermarket.com/userfiles/file/fexizufosawulokago.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_off0000d853.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16792 bytes
font_01_sfnt_off0000f065.bin
548f6e6318d13455d7adb156d23b93eca29c07ffb2c1cc81afc7178162f39067
pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 17088 bytes
font_02_sfnt_off00011d09.bin
4dfc6f86c429e3baa2fc3abddb5142400728d622321a3e639633095cab36383c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 10096 bytes