Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2ead24d21899e2…

MALICIOUS

PDF

131.0 KB Created: 2021-07-07 05:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 01aee2152753476c5a21a79219a3925a SHA-1: da494faffba4fd1f42d7c1e771b74f172a2889b9 SHA-256: 2b2ead24d21899e220ff6e957ba5e750e5a73910b648843bf5cfe816e1b669cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, hosting numerous PDF files on compromised WordPress sites, likely for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the structure of the PDF suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/200760b2dff172f67550400961e1b291/53306594070.pdf In PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/wevarejen.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/kodegekowajamojufezuf.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4c55aac50c15ad96bbc15e612a157be1/rinobojegu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e4cfbc0a574eec0433fea8ee42af5a9a/28000243642.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/22561335583.pdfIn PDF document text
    • https://drsaman.com/files/foliwukawiv.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6f8eaa46---zonaxozexofevaxil.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/60d00ab1e852ed23312761b53e511d78/vexinixo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28421ef8c4---dipatemirizuxalup.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/95320455408.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/94dc3f10828321aa0eb6637417e4135c/56230500748.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8f544a87---xubuxipata.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095baee27d33---14683735524.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a34de5f7---reredusopagado.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/nuxixijujodorubixuj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ggols288di8h912vu0ot6pvg21/2164807088.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713e1b2de0---4201385999.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/434f51b39e793c584db2fc137f46bcbd/98869028490.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf4888c5b---fixajikejajalodemumoxa.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79eb187f---kurowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=use+spend+in+a+sentencePDF link annotation
    • 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_off00019ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4FF 10248 bytes
SHA-256: 5d6fc6275a9e055d294186b8ce2b6eff334f19d63184468e5673ccfd778c4458
font_02_sfnt_off0001cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC29 18736 bytes
SHA-256: 5a7443f3117bdf18c66aefa46db28f97bef28d69bd39e0da14dededc229387a2

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