Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28cf2b33204fc35…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 04:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06613953b04d0fcd56a7561365c44d3e SHA-1: c7d644eb967db775dffa2943a7ef2de75d88f83d SHA-256: c28cf2b33204fc3517b144fead3af194ba572fe20da9b1884f4003092c1e29b7
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is likely used for phishing or to distribute further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=the+acid+ghost
    • http://lblussana.it/images/file/remujobi.pdf
    • https://angkoronetour.com/userfiles/file/39085652669.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160808a720b8bf---wepimitewojefomekinet.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a9944593---5533004024.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/41350dbbc73580dc19bcafd60cbeecbf/nudezex.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5bcbse4j563srf1jal8upm7dvj/81676986625.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/takn1b30scbi0apt5rl7d4fhkn/6458505705.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8pb6q49h9of42ltu25vll85972/girozazavasuju.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d86b287f8c---gijanizelifisagiwunimedi.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gat6utle5efc2p1954q6s93j67/56789367473.pdf
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/a5f4cd6a185072393222edbb546f3782/wodubitosiwo.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/8go4m42k2dm94119bmrocaaqdk/bafuloso.pdf
    • http://bluefield1966.com/clients/26642/File/80831411564.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160948f3bc16ee---7657933138.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d432c0919cc00f85bffa0b63a71aa76c/29465601117.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa985078c2---senojovatitalawu.pdf
    • https://workinhotel.com/upload/fckfile/66373727080.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd006b9be---jadeleletu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609634762a0c4---63246650350.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b73e4605---82509063538.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429477f664---92592269905.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jikativoxijowirixed.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7a6660e108605d3aff36c69ed61ce0d/49221370963.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07c556d438---wuxuzodefiduvubi.pdf
    • https://anjingliar2.com/contents//files/58408100297.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jrfar61m2v8be2alllvgqttm65/lugutevolizitopererusav.pdf
    • http://quickvideo.nl/userfiles/file/19703080256.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14abc5f1c---bexazogow.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_off0000ece8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
font_01_sfnt_off000104ff.bin
7b34c3a087f374881f70e106e6c3a53483cf17544065574db21a4f4f89ec8371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10360 bytes
font_02_sfnt_off00011c5b.bin
d07bc0f43ed71bbc0fdf72b86925723380419a643748fd13a1a925be48144d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 18312 bytes

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