Malicious PDF — malware analysis report

Static analysis result for SHA-256 2210c5698d96492b…

MALICIOUS

PDF

80.8 KB Created: 2021-06-15 12:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c9628ca0719ec6f31b47709b8b4f2362 SHA-1: ada65e705a96733b33df3608eac9fd4614874365 SHA-256: 2210c5698d96492b08a3922c10bbc97c2a41f09e31effd11f5f346ee1a88aca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains numerous links, many pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious content. The presence of 'utm_term' parameters suggests an attempt to track user engagement with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=letter+activity+worksheets PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160817388f1970---nopirorezopufexusara.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63583a1c0---79898713524.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7fce7703---27166330328.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63c7ce759---58734104706.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfdc501696---zigazofokunidok.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097284a306b3---87619753444.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mpauep8bph842ndt3edfqlvp35/1570792003.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1749cc6d9---96609413319.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc39fb1e046---wukevevexozazesiromidi.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/5061015664.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/93478284f60d15d878a21bb7c0899e27/kavukuduvovuzewasojusu.pdfIn PDF document text
    • http://klpa.net/userData/board/file/tisumoparavujokono.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/26218766347.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/suwaxixikupemabumokedub.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850d3b7c91b---sedofuwadanatevowidikibu.pdfIn PDF document text
    • https://immobilgold.com/file/lekunaxuluvosojadutivo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/48094295651.pdfIn PDF document text
    • https://sbufficio.it/file/96108030321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 4796 bytes
SHA-256: ed18de876a2051593c83e7c3a4cf3701eae0560407315a3f2348d706702fe52f
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 11368 bytes
SHA-256: 83aadff32bf7aec97808c5aa42c7afd348b5e8d79dfa115a891502aa5495e8d3
font_02_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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