Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b28bb5d9db5683a…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 12:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b29f0170bd47e22e4ef75f2b2cc6cb8e SHA-1: f931bb4c3fa89b9d210b0a2dc269a58c05bd0ddd SHA-256: 4b28bb5d9db5683a39849bdb2acdc83bd396f80d004b610e59432a76c391d2b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing threat by ClamAV. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, designed to redirect users to potentially malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=parts+of+the+speech+exercises+pdf
    • https://footballsod.com/images/ck-uploads/files/58571384649.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/patelukodafuzarefemu.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d649c9004---67632524979.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7558e3b06d---kiwusab.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/76keaqq12j9j4crd86pej7di57/mexusuj.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hrdd64iporp9mhqmb8vtu46q1e/36503920751.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8316c348ee---zagakujimazifamapemobig.pdf
    • http://alkanboya.com/files/file///70657124602.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce8275534---93844379329.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea326a3620---luloganipewuwejuf.pdf
    • https://alatheir.com/atheirwsfiles/file/nefadivivibopow.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/filagedoxemiboguvakurutor.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7e6a6950177c660128a5844784554712/dekepemifasabukoj.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/4fc892a17870fb9fefd28a3ace522a68/vebugobetovodamap.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tnh63hpkt4kuhrntehcs70723k/fuzodavovam.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_off0000e594.bin
67254fed5600b22cf94046348323f1c4e0c296a69958f33f2dd180e513d1d26d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10672 bytes
font_01_sfnt_off0000fe34.bin
ed6b2b10a21c950e195a0b7d9b085e51536a512f08a738678ce250b26402d936		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 17896 bytes
font_02_sfnt_off00012cd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes

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